The Most Powerful Side Effect: I Became Invincible After Transforming into a Beautiful Woman.

My genius fell, my beloved betrayed me, my engagement was canceled in public, and I became the laughing stock of the whole city. When I was about to die, I activated the yin and yang creation system, but at the cost of becoming a man during the day and a woman at night! From then on, during the day, I was the avenger who tore up the divorce letter and made her hate her to the bone; at night, I turned into a stunning fairy and became her only best friend who talked about everything. She will never know that she has personally created an enemy who understands her best. This revenge is not only about regaining dignity, but also about killing one's heart!