He's more worried about MCs health IIRC. Cuz in the novel, he spent a lot of energy doing first aid to the guy who collapsed. Yeonsoo gets hospitalized after this too cuz it really drained his energy (like empty empty).
Also let's remember that Yeonsoo is an unreliable narrator because he assumes that ML is still the same from the book. (He's defo still obsessed but less extreme)

Bru....is this how serious? He already pissing be tf off with his possessive nature I swear if he finna throw a temper tantrum because MC saved someone's life inna start tweaking