In public, Luo Tian is a tough guy who can beat up punks and knock out bastards. All it takes is a pair of ripped jeans for people to call him Brother Tian.
But at home, Luo Tian is virtuous and domestic, equally at home entertaining guests or cooking in the kitchen. Wearing a pink apron, he makes meals for that bastard every day.
The way Luo Tian acts in public is his true nature. At home, he's forced to suppress that nature and obey the other man, even speaking softly and gently. As for why, Luo Tian had to put himself up as collateral to Han Han to save his mother's life.
At first, Luo Tian only planned to leave that old bastard Han Han once their contract ended. But without realizing it, he fell in love with Han Han.
Han Han initially wanted Luo Tian to treat his unrequited love's illness, but later he regretted it. He wanted Luo Tian to be happy and healthy. He wanted Luo Tian to bear his child. He wanted to pamper Luo Tian for the rest of his life.