Legion

Because there both different story arks think of it jinwoo comes from a back story of a person struggling for his family and sacrificing every for those he cares for no to mention he's dealt with betrayal countless times making it hard for him to want to open up. Suho background dosent deal with as much suffering as his father or the struggle. It's just like Naruto vs Boruto a kid that had it hard vs a kid that had it much easier