Lee Hae Ri has a beautiful singing voice and style, and puts a lot of emotions in her songs... very expressive.
Davichi - Don't Find Me Again (다신 찾지마) [Eng+Rom+Han]
This song was sung by the guy who founded the wonder girls.
She sang the cover on the show.
What sounded like a "crack" at the end was emotionally induced and beautiful done.
Lee Hae Ri (Immortal Song 2) - Behind You