Ian is a cutie meanwhile Brian's personality made it painfully annoying to read. The 2nd season is completely unnecessary since 1st season already gave us the essence of what had happened with Brian. Plus, Ian is the reincarnation and it's not like he is living in the 2nd timeline that he'll eventually get Brian's memory. I wish the author doesn't change Ian to make him similar to brian#-.-)
I can understand, in season 1 I felt sad towards when the ML's deceased lover was mentioned but then they pulled the reincarnation plot which spoiled everything. It simply means that the ML did not fell in love with Ian rather he was only concerned with him because he is Brian's reincarnation
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-That the author didn’t draw out the flashback. They did just as much as they needed to and got back to the story. Too many authors draw out certain parts of the story and lose attention to the plot