Lee Joon interest with Jieun when he was child , when he move to London he choose for concact jieun with use email ,

but Jieun never interest to reply joon email for her , and hyosung did it for her . Joon didn't know about that so he always think that Jieun who reply his email and when Joon comeback to korea , he know everything .

and that the begining of hard situation.

Love does not just mean to say I love you to someone.
Love is love without even saying anything.
Love also sacrifice, it also means silence for each other.
Love not only has.
Love also was handed, your own happiness for other people happiness.