Beoning (2018) online

Jong-su, a part-time worker, bumps into Hae-mi while delivering, who used to live in the same neighborhood. Hae-mi asks him to look after her cat while she's on a trip to Africa. When Hae-mi comes back, she introduces Ben, a mysterious guy she met in Africa, to Jong-su. One day, Ben visits Jong-su's with Hae-mi and confesses his own secret hobby.