Here's the link : https://www.mangago.me/read-manga/on_doorstep/mf/c002/1/
Credit page at the top
He should be the beta from the second couple if I remember correctly.
https://www.mangago.me/read-manga/kashikomarimashita_destiny/
Hi this is an office romance manga (i don't remember if it was rivals to lovers or not) but after they get together, one of the main lead has a short trainee under him who falls for the main lead but he sees him kissing the other main lead in a printer room and does some plotting against the latter.
Anyone got the raws? Or the novel translated to English?