Inwoo should've said the truth from the start. It's not Jiho's fault not understanding him. Did Inwoo told Jiho that he and his mother got abused by his father? Nope, he didn't. He just said he got abandoned by his mother and said nothing about the abuse. Did Inwoo told Jiho that he doesn't want to meet his mother? Nope, he didn't. He said they missed each other and couldn't meet. Maybe they will set up another date to meet. Inwoo covered up his truth with lies and blamed Jiho for not understanding? Inwoo the one who blinded Jiho from his true feeling. He couldn't say that he hate his mother and doesn't want to ever meet his mother again. Inwoo is the one who refused to communicate. Jiho just tried his best to heal Inwoo's miserable but Inwoo doesn't seem want to heal it instead he want to stay miserable because he afraid to face the miserable things. People like Inwoo is hard to fix even with love. He need to meet with therapist. You need to have patience and care to slowly heal them. I don't think Jiho have those trait. He can care but patience hmm..
Tbh, I hope they don't stay together in the end. The happy ending doesn't have to have both of them together.