Daddy Duo

There is a young adult, Pat who gets kicked out of home by his dad, to earn money by himself. He can stay at a condo where 2 girls, Pin and Bet, live as his neigbours. Toy, a friend of him, who is like a little brother to him moves to his condo, becuase he wants to find a job in Bangkok. One day a little boy gets hit by a car in front of the condo. Pat wants to help him, but unluckily the child loses his memory and misunderstands that Pat is his dad. So Pat has to keep him and take care of him and find his real parents.
(Source: AsianFuse Wiki)