Singer Lee Seung Gi recently�opened up about his first love.

On the February 7th episode of SBS 'Strong Heart', guest Moon Hee Oak asked MC Lee Sung Gi to sing her hit song, "Last Name Kim".

After Seung Gi did his best to emulate her unique style of singing,�Boom made an additional request, saying, "Sing it, but add the initials of your first love."

The MC who did not want to reveal her full name cautiously remarked, "She may be watching," and continued to sing the song by modifying the lyrics to, "Last name Kim, first name SK."

Also on this episode of 'Strong Heart' were Lee Minho, Lim Siwan, Lee Yoonsuk, Lim Jieun, Kim Yoon Kyung, Chae Rina, and more.

Who's the lucky girl that once stole Seung Gi's heart? Are your initials SK?

Source & Image : TVDaily via Nate