OMG I remember reading this back in middle school. If I remember correctly this book was about some guy getting transmigrated as a carp and with the help of a system he transforms into a koi fish and eventually falls in love with the emperor(ML). In the extras they have a few kids and ML somehow can also turn into a koi and they all live happily ever after. Now that I look back at this, this was weird as fuck but did that stop me from reading? No. Anyways, non toxic ML and MC, slowburn, misunderstandings, face slapping, and funny moments all in one here.