There wasnt going to be alot of development between them because they haven't known each other for a long time. I think season 1 was about Eun ho moving on from his relationship/friendship with Joohyuk, that's why there was a lot of focus on that relationship and why it may have seemed like that had more chemistry when in reality they just knew each for long time. it's familiarity vs chemistry.
I don't think Dochan is boring at all..I personally don't think I need to know his past to consider him an interesting character. I like his personality and I like that he treats the uke well.
I disagree. The MC was being blackmailed and used for sexual favors for however long. The "relationship" with the red hair guy was toxic even before the rape part. The black hair guy is not boring, he's stable, loving, and respectful to the MC. We didn't get to see a lot from him because the manga was more focused on the dynamic between red head and the MC
this story is just badly written imo. red haired guy and ML had more chemistry until the r*** scene; now he’s unlikable, and the black haired guy is boring af.