Responses
I don't know, I more think it like.. the blonde and boss are friends, and the wheelchair guy is boss ex-boy(I feel that this guy is boss ex-Top based on the picture) there somehow happen between the boss and his ex so his ex end up in wheelchair. The blonde secretly had an unrequited love for boss, so he act dependable and treat the ex for boss sake so the boss wont feel uneasy about what happen with his ex(I think this tragedy related the boss like he did something bad so his ex end up like that
I think the blond guy is the bosses ex and the guy in the wheelchair chased after the blond guy.