There was no transmigration in the first place. MC was emotionally abused by his father, he was depressed, read a novel about a poor boy who wanted to learn piano and assumed his identity. Cool idea, but like I said, it was strongly (as in you have to be blind to miss it) hinted, but I was hoping for the other explanation. Originally MC is a sheltered child from a rich family. His "new" identity is a poor boy who had a paralyzed mother. To care for his mother he learned to give medical massage. He actually went to a med school (or where they teach you this profession) to later earn his living caring for sick people. So once he became acquainted with a paralyzed ML he was like "excellent! I have skills to help him, I am literally trained to do it!". The plot hole is "where did his skills came from, given that he has never actually gave massage to anyone?". (I wonder, if he read a novel about a pilot, would he be able to pilot a boeing?). Anyway, once he realized that he is the real owner of this body, he had a good cry over it and it was never mentioned again.

MC's memory before transmigrating seems to be disappearing. I wonder if there is a plot twist where maybe the transmigration part is merely a delusion he thought up to cope when he suffered avoidant personality disorder. At c55, MC was wondering why he thought he already studied his 3rd year of high school education. (This is due to MC having completed his 3rd year of education and is preparing to do the college entrance examination at the start of the novel)

Moving on, Wen Yao is actually Qin WenYao, ML's older brother. He dislike both his parents' surname but took up Wen as his surname since a dead parent's surname is better than an alive parent's one. He is constantly getting fed dog food from MC and ML affection everyday. ML gets information from Wen Yao such as clothing size and favorite food. ML received MC's necklace and MC told ML that the necklace signify MC protecting/being beside him since OG!MC's mother gave it to him. The emerald inside the necklace was mined out on the day of OG!MC birth. So the necklace is like an extension of him since its been with him for so long.

the novel includes mentions and/or depictions of child abuse (physical/psychological), domestic abuse and sexual violence (NOT!!! ML!!!!), suicidal thoughts and attempts. depictions of bipolar disorder, avoidant personality disorder, and manic episodes.

Child abuse includes parents ordering their children to be told they are unskilled/bad at what they love causing significant psychological damage, physical violence, children witnessing domestic violence and sexual abuse between parents, children witnessing a parent's manic episodes, including the parent trying to kill them during a manic episode.

Mentions of suicidal thoughts/tendencies throughout the story, mostly focused in the beginning/middle. References to a side character's frequent attempts to commit suicide before being locked in a sanatorium, as well as directly covering a main character's attempt to commit suicide. Strong/hidden hints at said character's suicidal thoughts are frequent throughout the beginning of novel.