Tae Heyung is the name of your deceased sister and Yeang is the name of her husband. But after Heyung died while on a picnic with you, Yeang always blamed you for your older sister's death, and he also did something unacceptable, which was to turn you into replacement Heyung. 3 years later, on the 3rd anniversary of Heyung's death, you intended to commit suicide with your older sister, but as soon as you picked up the knife, Yeang stopped you.

"Tae Heyung! What are you doing!?"