Manhua title?

Does anyone know abt this manhua whr both seme n uke were a couple but then seme had to go overseas and told uke he would be thr for a month but then uke also went overseas for job related but also was able to see him and ik during a party uke had a quarrel w seme collegue and went back to their hotel rm and told seme to break up and seme said something (cant remember xD) also seme never had a discussion w him that he would be staying overseas a mnth longer.. ( i guess)

Some bg abt seme he cant convey his feelings properly,, he likes math (i think)

uke is a chaebol / basically his fam has a business( if i remember correctly/ used the term correctly) (apologies if i use it wrongly)
(=・ω・=)

Thank you for reading xD