Engaged with my childhood friend that has an amnesia

Ever since they were little they're lovers childhood lovers actually but then everything change when that day comes Stephen ayle had an amnesia and never remember who he is who is kristhen to his life and along came krissy that he recognise as his girlfriend, kristhen flew to States and study there after ten years she came back but Stephen still don't remember her...... They were engaged by the blessing of they're mothers they live in one house that build for them but will they ever going to be okey when Stephen is now a bad boy that treats kristhen as a rival?