Genetically modified hero who escapes from an island owned by a government organization falls in love with a school teacher who teaches his son

[Shravani]

. Hero is genetically modified to be a fighter. And men like him are kept on an island and sent on assassin missions. Hero escapes from this island and meets someone ( not heroine) and they have a son. Later in few years hero meets the heroine who is a school teacher that teaches his son.

[Lobstergirl, au gratin]

Shravani, please add some of those plot details to your header/title. This helps the people searching for your book. If you are unable, ask for help.