If what you said about "realistic character development" I also feel the same way, more about the complicated relationship bw Yu Kenan and Xu Tan. Maybe it's because they have a balance role and screen time here, meanwhile Yu Liang in Hikaru no Go was like a "supporting" main role.
So I think this one is a sequel to Go Brother! (2018) which main roles are Peng Yuchang and Zhang Zifeng, and that one is way way wayyyyy better than this one (though I love Xiao Hu no matter what role he plays). Yang Tingyu doesn't have a likable personality here, the new brother first encounter with Tingfeng also quite weird. Greatfully they deleted the scene where Tingfeng got slapped for not taking the new bro out for dinner, unless it would be a lot more weirder and unreasonable. I highly recommed Go Brother! instead of this