Is My Merman Brother coming back?

Lin Weixu, the female State Preceptor of the Qin Empire gained her authoritarian power after conquering Nanzhao Empire. One day, she ran into Fusu, a merman captive who was tortured by the Supreme Court. Out of sympathy, she rescued the merman, and he became clingy to her. Thus unfolded a therapeutic and sweet journey. Together the couple uncovered the culprit behind the murder of the former State Preceptor and rooted out treacherous spies in the imperial court.

Adapted from the web novel "Jiao Ren Di Di You Yao Wo Le" (鲛人弟弟又咬我了) by Mu Tou Xi (木头兮).