Does any one know the name of this song from the korean drama full house?

I know is in epi. 3 when she is walking home. The only part I understand is the english part when the singer says " I think I love you" then she sings in korean I believe. Ive also heard this song in my girl I believe but cant be sure because Ive been watching many kdramas lately. Please help me find the name of song and the artist who sings it