Of course, this is season 2. The story of this drama (Love of Replica) is a novel written by the 2nd Female Lead of 'Mysterious Love' who is Qiao Yu Fei. So this drama showing as a novel adaptation.

You can get it if you watched the Easter Egg scene after the credits in the last episode of 'Love of Replica'. (You can understand this scene if you watched 'Mysterious Love' tho?)

Most likely there will be season 3 where Jiang Hao and Qiao Yu Fei come back as a couple and that season also will be a novel by Qiao Yu Fei.

Qiao Yu Fei (the writer) makes an appearance in Love of Replica where An Yue was kidnapped and dropped the phone for a stranger.

Also, it's not necessary to watch season 1 before this drama since there are two different stories if we look from the viewer's perspective.