Whats the omegaverse title plsss

Hi! I'm looking for a Korean BL (omegaverse) manhw. Here's what I remember:

- The main character is a pink-haired, architecture intern with multiple piercings.

- There's a black-haired architect (second male lead) whom the MC admires; he also appears as a professor at one point.

- The blonde, stylish alpha male lead is the MC's FWB which secretly sets him up as an intern with the second male lead. He's also a student with a sister.

- There's a love triangle, possessiveness, and an omegaverse dynamic.