God's Apostle: Rebirth of a Lazy Genius - Chapter 81 Reading Destiny?

Due to rejection of the heart donated by her ex-boyfriend, she married him and supported him with her own blood for two years. After the rejection disappeared, he unexpectedly filed for divorce. She readily agreed and left, revealing to him how he gotten the heart. When he learned the truth, he was furious and disgusted with her.Five years later, she pretended to be dead and returned with their child, disguised as an ugly nanny...

She is one the most famous thieves of the twenty-first century and the legendary racing queen who is unrivalled in the underworld.

She is a carefree girl who comes and goes as she pleases like the wind.

He is a powerful underworld boss, known to be cruel and merciless.

***

He didn’t think that someone would dare to provoke him by touching what belonged to him. Since they had shown him enmity, then he would return it in her stead.

Passion. Love. Hate. Pain.

It was all impossible to unravel.

- Description from Novelupdates

Kieran was just an ordinary part-timer — a high school dropout who had also given up on boxing. With no parents and no real family, he survived by working his ass off every day. He was raised by a man he believed to be his father, but later discovered he wasn't — though the man passed away before the truth could fully sink in. What Kieran didn’t know was that he was actually the sole heir to a powerful business empire, the hidden son of a wealthy tycoon.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.