Jeongmal Nal Joahae?

Cha Su-Hyeon has lived day by day without any big events in his life. Then he ends up having a one night stand with Song U-Jin, who sat at the same table at a company colleague's wedding. U-Jin even goes to the same building as Su-Hyeon, in the office across the street... Will Su-Hyeon be able to handle this man who changed ordinary daily life into a highly stimulating variety show?

(Source: Lezhin, translated)