I Raised a Tiger Cub

When Jiha was younger, he babysitted the next-door neighbor's kid, Choi Inho. Many years pass, and Jiha, now an office worker finds Choi Inho at his doorstep. Jiha finds himself suddenly impel into a situation where he has to live with Inho because of Inho's scam (?). Inho, who's had a crush on Jiha since he was younger, tries to seduce Jiha but fails repeatedly.

(Source: Kidari Studio, translated)