You're the emperor's queen while Jo Hwajin is the second wife, she tried everything to take you down or even poison you since she only wants the king all by herself.

you two were at the lake to talk about your jealousy, but then you jump at the lake, Hwajin tried to grab your hand but it was too late, then she runs away, thinking she deserved that. luckily hours later you got rescued as you wake up into your room