The Favorite of a Wealthy Family: a Fierce Wife Is Not Easy to Mess With

A top killer infiltrates the world's largest plutocrat to investigate the truth behind his family's extermination many years ago. Unexpectedly, his identity is accidentally exposed to the illegitimate son Third Young Master who has the least inheritance rights. He makes a contract with the Third Young Master who pretends to be a pig and eats the tiger. The cooperation between the two officially begins. She wants the truth and he wants revenge. What kind of sparks can be created between the two people who each get what they need?