Kim Min Soo finds himself estranged in a dark room, not a speck of light enters his field of vision. Reid doesn't seem happy that Min Soo dozed off on Tae Min's back, there's a hint of jealousy in his tones.
However, the thick-skinned Tae Min doesn't notice his comrade's jealousy, of course. The typical reaction coming from a handsome male character with a dense characteristic.
Tae Min is quite sensitive, to be honest, he knows if something is wrong with the person he acquaintances with. He's just not that sensitive to love-related feelings, since he barely had the time to focus on that. The model got his plates full by taking care of his sibling's funds, he's a responsible man; too responsible in Min Soo's opinion.