Arirang (아 리 랑).
Unconditional (무 조 건).
Her song (사 모 곡)

시계는 아침부터 똑딱똑딱

Here is a presentation a Korean elementary school teacher made to teach the song to their students; it includes a video with the song and subtitles:

http://prezi.com/bmq7h8sk8-vu/presentation/