Parents separated due to amnesia and reason to unite was their children . for the children they decided to live together based on contract . Both loss their memory so both of them had doubt on each other . How their children looked alike . both of them thought that one of them stole the other child . in order to know the truth the male character made her agree to live with him and then anyhow he would take the other child from her but slowly slowly every truth come out and they lived happily ever after.