당신을 만난

having met you

→ 당신
phrase Uncommon #8,254
having met you 당신 means “you” as the object of the verb; 만난 means “met” and modifies what follows. 당신 can sound formal, literary, or intimate depending on context.
KO: 당신을 만난 건 정말 행운이었어요.
EN: Having met you was truly lucky.

당신을 만난 건 내 인생 최고의 행운 이었어요

Meeting you was the greatest stroke of luck in my life.

— A Moment to Remember (2004)

당신을 만난 뒤 그렇게 됐지

That’s how I ended up after meeting you.

— 옛날 옛적 서부에서 (1968)