Student teacher relationship,
just started watching chongzi but for now i can say there's gonna be a lot of angst.
i think it might be similar in many ways.

kinda similar ml dies and comes back after 12+ years.
although in TU the ml can stay back as he was brought back to life due to a ritual.
both ml set out to solve the reasons of their deaths and also just like in RW lot of people believe that the ml was the murderer.
also get to see sibling bonds although its a bit of a sad story for the siblings in TU
TU is a Chinese costume drama. but you should give it a try.
warning ?? it keeps getting sad every time you rewatch the drama.