:B Hehe.
Ohh, It's from the OST, SECRET GARDEN.
It has 2 VERSIONS, One is this, THAT MAN, and the other one is THAT WOMAN. I think the LYRICS ARE THE SAME, only the SINGER and of course the TITLE.
Han namjaga geudaereul saranghamnida
Geu namjaneun yeolshimhi saranghamnida
Maeil geurimjacheoreom geudaereul ttaradanimyeo
Geu namjaneun useumyeo ulgoisseoyo
Eolmana eolmana deo neoreul
Ireohke baraman bomyeo honja
I baramgateun sarang i geojigateun sarang
Gyesokhaeya niga nareul sarang hagenni OH
Jogeumman gakkai wa jogeumman
Hanbal dagagamyeon du bal domangganeun
Neol saranghaneun nan jigeumdo yeope isseo
Geu namjan umnida
Geu namjaneun seonggyeogi soshimhamnida
Geuraeseo unneun beobeul baeweotdamnida
Chinhan chinguegedo mothaneun yaegiga manheun
Geu namjaeui maeumeun sangcheotuseongi
Geuraeseo geu namjaneun geudael
Neol sarang haetdeyo ttokgataseo
Tto hanagateun babo tto hanagateun babo
Hanbeon nareul anajugo gamyeon andweyo OH
Nan sarangbadgo shipeo geudaeyeo
Maeil sogeuroman gaseum sogeuroman
Sorireul jireumyeo geu namjaneun oneuldo
Geu yeope itdeyo OH
Geu namjaga naraneun geol anayo
Almyeonseodo ireoneun geon anijyo
Moreulkkeoya geudaen babonikka~
Eolmana eolmana deo neoreul
Ireohke baraman bomyeo honja
I babogateun sarang i geojigateun sarang
Gyesokhaeya niga nareul sarang hagenni OH
Jogeumman gakkai wa jogeumman
Hanbal dagagamyeon du bal domangganeun
Neol saranghaneun nan jigeumdo yeope isseo
Geu namjan umnida