Aiyakarn (Stefan) gets into an arguement with his father over a girl (who is a mistress to a rich guy). His father is against his relationship so he flee abroad, he doesn't know that the girl was pregnant. The girl give the baby to Aiyakarn's father and Aroonwalai (Kob) to take care of. After Aiyakarn's dad pass away, he is contact to come back for the opening of the will. He doesn't go home so he doesn't meet Aroonwalai even though he did call her once just to check up if she's dead yet. Haha. Aroonwalai tries numerous time to help his financial needs, but he rejects all of it. After getting a job Aiyakarn meets Aroonwalai at a bookshop (Not knowing she was his step-mom). They meet numerous times, one day Aroonwalai wanted to tell Aiyakarn who she really was but couldn't, she fill herself with alcohol because of nervousness and gets drunk. Aiyakarn doesn't know where she lives so he takes her to his place. *Ahem* Something happen that night...
Aiyakarn wakes up to find Aroonwalai had vanish. Within that same day when the will was open he finds out that Aroonwalai is his step-mother.
The will states:
"The will states that Aiyakarn will get the whole inheritance if he lives in that house for 4 or more years by having to be a guardian of a little kid name Anupant (Look Ord) conjoining with Aroonwalai. If he wants to use any part of his inheritance, he must have agreement from Aroonwalai first. If he can't follow the orders of the will, he will not get anything at all."