It's because he actually knew mc since childhood and mc was the only person who cared for him like giving him food and talking with him while his mom doesn't care about him and yoochae really wanted to be close to Mc even at school bc they both went to the same school but Mc didn't see him and stuff so bc of that, he actually put on that persona stuff but he was actually planning tell mc about it if I remember correctly

novel readers can u spoil me how the fuck is mc getting chat's from yoonchae while he's driving if he's the same person