Interesting take. I didn't see it this way at all. Taeho didn't say he was going to get his phone from jiwoon, he should have been open about that but otherwise he hasn't lied or withheld any other info.
Taeho saw his bf kissing someone in their shared space when his bf knew he was just in the other room. I'm not sure how one could jump to conclusions walking in on such a scene. He is too sweet a guy to confront them as most folks would so he ran out. He was drugged by that guy after he was already drunk. He went off with that dude to make the MC feel what he felt but he planned to leave that guy immediately. He couldn't bc he was drugged but that was his original, inebriated thought process. It's a shame he is so trusting of jiwoon but hey he lived a sheltered life unlike us city-wise cynics

Idk y I'm reading this taeho keeps lying and jumping to conclusions.... like break up with him already. He even chose a stranger over MC. If the entire manga is full of taehos bs and the other MC being a doormat I'm giving this shit 1 star.