Thep Sam Ruedu

It's about a King who wanted a child, but both of his wives could not bear him one, so he asked God. God sent 3 people, 2 guys and 1 girl, in one body down to be reborn as humans. As the season changed, they changed into the 3 different people that God sent. As they grew, they began their journey of finding their beloved and bringing peace to earth.
(Source: AsianFuse Wiki)