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This is a quick and short summary but Cheongdo met his father, and they got along well without realizing their connection. His father had a gambling problem but was deeply in love with Cheongdo's mother at the time. He gambled in hopes of giving cheongdo mother a better life. In the end, his father passed away, but at that moment, Cheongdo didn’t know it was him. (I think he saw him die. The gamble is like you have to sacrifice your body part to win smt and he lost)
Later, he went to his father’s room and found letters exchanged between his parents. That’s when he realized the truth, his father was dead. Overwhelmed, he had a full-on breakdown, crying, hurting himself, and eventually passing out.
Here the thing he can feel emotions. he just blocks them out as a coping mechanism. When he woke up, it was as if nothing had happened because he had already shut those emotions away. In the recent chapter he met his mom again and hugged her. Even tho he say he can't feel emotions he does. He just doesn't understand them. He valid his mom and his dad. He love them a lot. He just doesn't know it.
Omh my heart is so heartbroken. I feel so bad for Cheongdu. like it broke into pieces l literally was about to cry