Exhibit 4.2

STOCK l'lJHCIIASE AGIU:r. ff - :NT 1 - '0ll ltrdlonr AJi:t Jnr. TIIIS STOCK PUHCIIASI · : AGIU:t::Mf. T (lhis "; \ grecrnent - ) is maJc as of lhe dJy of larch:?:?, 20:?3 b) ' and mnon!:! Chon yi \ 'ani: (lhc " Seller"). and Gfol,al A \ ,tt Opualion Group Ctl,, l.imilrd (lhc ··run:h:iscr"). The Seller. and 1hc l'urch:i s cr :m: so mclimc: s rcfcm:J 10 :1s the Party .ind colkcai, · cly as the "l'artics" . Rf.CITAtS \ \ 'llf.ltf.AS, Seller o,,ns a tolal ur 1,700,000 sh:m:s of Con, · crtihlc Series, \ Preferred Stock in Rrotunr Asi:1 Inc., a l':c \ 'ad::i curpora1ion (..RTAS'', the •·company") and wishes 10 sell l 05.000 of s uch shares (the "Sh;ucs"). The Sh:ircs will be issu""d as follows: • IOS.000 Shares in 1he name of Global Asset Operation Group Co.• LimitL"d \ \ 'IIF.JU:AS, the Purcha s L"r wishes to purchase all of the Shares for a toul purchase price of S30 , 000 USO (lhc - 1•urch:1sc Price"). WHEREAS. the Seller proposes 10 sell the Shares to the Purchaser on lhc tcnns s et forth hen:in and Purchaser \ \ ishcs 10 purchase lhi: Shares from the Seller on the 1cn11s set forth herein; IN CO Sll>EH.Al'JON of 1hc promises . rcprl.!scnt:itions. \ \ arrantic. - s . and cownants cont:1incJ herein :ind other ooJ and valuable con s ic.kralion. thc rcccipt :md sullicicncy of \ \ hi,h arc hereby ackno \ \ fcdged. lfu: parties agree as follo \ \ s: 1 I. PURCHASE AND SALE AND CLOSl G 1. Conditions lo Clnsin!! . It is agreed that all the funds cunsistin:: ofS30,000 of the Purchase l'ricc shall be rcmiued to the Seller and Sh:ir s shall be rcmittcJ to Purch:iscr upon closing. Sec Exhibit , - \ for wire instruclions . 2. Termination. In the C \ 'Cnl the s ale and purchase of .1II the Shan. - . s pursu:int to this Agreement is not completed on or before Jun.30.2023, lhis Agreement shall tL"nninah: . 2. UEl'ltf.SENTATIONS AND \ \ 'AIU{ANTIF.S or THE SEl.LF.R 1. The Seller warrants, co \ · cn:1nts, nnd represents to the Purch:iscr with the intention of inducing the Purch:is1. - r 10 enter into this Agreement that: (a) The Seller represents and warrants 1h:11 the Shares h c ing sohl pursuant 10 lhis , \ grt" \ :mcnt represent all of lhc shart - s of RT, \ S Preferred Stock owned by thl! Sclll!r.

(h) lmmcdintely prior 10 nnd at the Closing. lhc Seller has the leg •I right .mt.I authority 10 sell the Shares to the Purchaser and nn chc Closing f>atc nnJ Seller shall lran - .for 1hc Shares In llu: l'un:lmscr free and clear of liens, cncurnhranccs. pledge<;, claims. options. charges anJ asscssmenls of nny nohirc \ \ hatsnc, · er, with full right and lawful au1hori1y to transfrr the Shan:s 10 nuycr. Nu person has any r,rcemrtivc rights or rights of first rcfus.11 with n,·sp ·ct 10 nny or drc Shares. ·1 here l.'xists no voting Di_!rccmcn,t · , oting trust, nr outstanding proxy with rcspccl to any or the Shares. There on: no oulstanding rights, options, \ \ 11rrnnts, calls. commitments, or nny other agreements of any character. whether oral or wrinen. with rcspccl lo the Shares. (c) The Shares nrc not subject to any lien arising in connection with nny failure or alleged failure to pay tax . There is no rending, threatened, or proposed audits . assessmen 1 s or claims from any ta . x outhority for deficiencies, pen ;: illics, or interest wi 1 h respect to Seller that would : itTccl the Sh : ires . (d) Seller sh:ill provide Buyer with tnie nnd accurate copies of ;ill corporate l:,ooks and records rel3ling to the Company in Seller's possession or control. Seller docs nol ha \ 'c :iny actu31 knowledge of any liability or obligation of the Company other than is rcn - ch:d in said books and records. (e) The Seller rr .: presents ; ind warrants that Seller has made no agreements involving : my fet . 'S of any type &hat relate to this Agrccml . "nl : inti lh : it would involve 1 hc Duyer, includinf : but not limi 1 cd to broker's fee, finder's Ices or any similar compensation arr : ingcment . 2 (f) To the knowledge of the Seller, (i) there is no claim . lcg : 11 aclion . suit . arbitration . in, · cstigation or hearing . notice of claims or other lcg : il . n . d 111 i 11 istr . 1 tin : or £ 0 \ 'emmcntal proceedings pending or, to the kno \ \ ledgi .: of the Sclkr . thrc : 1 tcncd against the Sell r or the Comp : iny : : ind (ii) &here is no continuing order, injunction . or dccC' \ . of any court, : irbitralor . or £ m·cmmcntal or . 1 dministrativc au 1 hori 1 y 10 \ \ hich the Seller or the Company is a party or to which it or any or its assets is subjc t . (g) The Seller has the legal power uml mllhority lo execute mu.I deliver this Agreement and all other <locumcnts required to be executed and delivered by the Sclkr hereundcr ancJ In consummate 1hc tmns::ictions conlemplatcJ hcrchy and this Agrccm nt has been ,·alidly cxcculcd hy 1he Seller. (h) The Seller, durin the past ninety ( 1 )0) days, has hccn a ten pcrccnl ( I 0%) or sreatcr sh:ireholdcr or an "ofliliate.. of RTAS, as thnl term is delined in Rut..: 1 - 14 promulgated under the United States Securities ; \ ct of 1933. as amended (the ··securities Act"). \

(il T,, lhc s, ,,f Seller' kn,,wledt!c, infnnn : llion 11ml bdicf, tlu.·rc arc nn cin:umstances that ma · n:suh in nny mnh:rial ndn·r. - ;i: effect 10 rrr , ,s or the \ 'aluc of 1hc Shares that arc now in e: \ ish:nce or muy h"·n.·.aOt.·r mis"·· li) The Seller agrees to cx" - cuh: nru..l dcli \ 'Cr uch 01hcr documi:nt s :rnd 10 perform such other acts as shnll he ncccs r) ' lo dfrctuntc the purposes of thi s , \ gn:cment. 3. REPRESENTATIO S AND WARHA TIES OF TIil - : l'l!HCIIASER 3 . 1 The Purchaser reprcscnts and \ \ ' : trrnnts to the Sdlcr with 1 he intention of inducing the Seller 10 enter intn thi s Agn . - cment that : (a) ll1e Pun:h:iser a s the legal power and authority to CXl - CUtc and dcli \ 'cr this Agreement :md to consummate the tr:msactions he hy conti:mplateJ mid this Agreement has been \ 'alidly cM. - cuh:J h · 1hc Pun:h:iser. (bl l11c Purchaser is acquiring the S hares us principal for the Purchn s "·r"s O \ \ ll account 4 for in, · cstmenl puq,,,sc s only. and m1t with :1 view I \ \ , or li.ir. n: s alc. distrihution M frae1ionaliZ!ltion thereof. in wlmlc \ lr in part. and nn ocher person ha s a direct l,r . inJirccl benclicial interest in the Shan:s. - &. IISCELLA ! "' \ EOUS 1. The panics herctll acknowkdge that lhcy have ubtained independent kgal advice with respect to this Agrc . - cmcnt : ind acknowledge that thi . !y fully understand the provi s ions \ lf this A n : emcnt . 2. Unless otherwise provided . all d o llar amount s rcfcrri : d to in this : \ rccmcnt arc in Unitc : d States Dollars . - t3 Then: arc: no representations. \ \ 'arramics. coll: 1 t1:r:1l ;1gn:i:ments. o r condition s concerning 1hc subjccl matter of this Agreement except a s 111:rdn spcci lied . 3 4. - 1 The notice addresses of the Partie s hereto arc a s follows: Seller: Chongyi Yang Room 1607. No. 1038, West Nanjing Ro:lll, Sh ; mghai. China Purchaser: Global As s et Opcmtion Group C o.• Limited Room 2408, Bl o ck B. Sun s hine Science aml Technol o g y P ; trk , Nunshan Disrricr. Slu.·nzl11:n 4.5 Any action ur proceeding seeking 10 enforce any prn \ 'i: - ion nf . or h;1sed on any right arising out of, this Agreement may he hrnught •gain s t :my uf thl! p:irtil! s in th \ ! courts of the State of Nevada located in Clark County, Ncv ida. nml c;u:h of the partie s con s ent s to the

jurisdiction ur such courts (nnd uf lhc appropriate nppcllatc courts) in any such action or proCl"C<ling 111,tl waives nny ohjcctinn to venue luid therein. Process in :my net ion or proceeding rdcm:d to in the preceding scrucncc may he served un any party onywltcrc in the \ \ Orld. 6. The representations and wnrra111ics of the parties contained in this Agreement shall sun·i \ 'c the closing of 1hc purchase and s.1lc of the Shares and shall continue in full force and cfTect for a period of one year. 7. This Agreement may be executed in sevcrnl counterparts , each of which will he deemed lo be an original and all of which will together constilutc one and lhc same instrument. 8. Delivery of an executed copy of this Agreement by elcclronic , facsimile transmission or other means of electronic communication cap:thlc of producing a prinh:d copy will be deemed to he execution and delivery of this Agreemcnl as of the date set forth on page one of this Agreement. (Signat11rc: p11g,• to folluw.J 4

IN WITNESS WI IEREOF. the p;mies hereto hu \ · c cxccutcd lhi,; Agreement ns or dale \ \ Tincn hdow. ..SELl.1 - :lt" Name: Chungyi \ 'nn n:uc: fay 22. 2023 "PURCIIASER" s

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