Uhm HOLY CRAP I DIDN'T REALIZE THAT WAS A PREQUEL!?!?!? I started reading a bit of that a long time ago but didnt continue because I couldn't understand why Yan Yi liked Lu Shangjin so much and I never made the connection. That's actually so wild. Haha Lu Shangjin was an absolute ass in the beginning.
Actually it is later explained that omega with gland like Yan Yi's tends to be faithful when they fall in love. They are strong and can live an awesome life without needing anyone, but when they fall in love they become dependent to their lover and will love them forever :(
All those regrets and sufferings Lu Shangjin went through in Everlasting Love resulting in this normal husband and father Lu Shangjin? It's nice to see them here being a normal family, with a cute lop eared bunny omega son Lu Yan