Oleg is definitely my fav in term of character developments. 'Tracy' in this is a transmigrated person who has lived atleast 18 years of life. Her previous life was also very traumatic and hard, making her an emotionally independent, hypervigilant, intuitive, and calculative person. For someone like her who has gone through all of that and survived, such astute traits are very obvious to be ingrained in her. But here, Oleg is just a 6 year old. He's raised very luxuriously and has seen the best that the life has to offer. For everyone to suddenly turn on him including his father, get beat up, you can't really blame him entirely. He was just raised in a bad way, but how he's grown with tracy is actually so nice to see for once. Like a child, having like 0 consciousness tbh, being put throught all that and learning from it and improving is so nice to see. This is a really good written manhwa, but the pace is so awfully slow. Just one arc took like almost 30 chapters and still counting btw, the characters are developing very naturally and at a good rate but at that same time, I feel like there is no change at all.