Whose child is the child in priceless true love?

It's Piman's own daughter, named March. It was when Allah and Piman were studying abroad. Piman was pregnant with a foreign girl and gave birth to March. Piman and Allah returned to Thailand after graduation, but Allah entrusted March to the care of the foreign girl and gave the mother and daughter living expenses every month. The foreign girl later found a boyfriend and left March alone. Allah took March back from abroad because she kept it from home. Piman was afraid that because of this child, he would make trouble but could not make peace.