Sesangen sumaneun apeumi isseo
Geu soge neoreul dul suneun eopseo, oh

Majuchin du nune
Damgyeojin neoui haru gadeuki useumi
Meomchuji anke haneun geosi
Amado nae sowonilji molla

I'm your happy virus
Neoui useumi (Woah, woah, woah)
Naegen geu mueotboda
Sojunghanikka, I'll be there for you
Muneojiryeo handaedo gwaenchana neul geuraetdeut
Smile, smile, smile
Jichyeo sseureojil ttaedo geokjeong ma neul geuraetdeut
Utja, utja, utja, I'm your happy virus

Neo uljima seulpeujana
Naega daesin apeul sun eopseulkka

Maju jabeun du sone
Namgyeodun uri haru gadeuki useumi
Meomchuji anke hadorok yaksokalge
Apeurodo yeongwonhi

I'm your happy virus
Neoui useumi (Woah, woah, woah)
Naegen geu mueotboda
Sojunghanikka, I'll be there for you
Muneojiryeo handaedo gwaenchana neul geuraetdeut
Smile, smile, smile
Jichyeo sseureojil ttaedo geokjeong ma neul geuraetdeut
Utja, utja, utja, I'm your happy virus

Naega neoui misoga doegopeun iyu
Nareul utge mandeun neoui sarang geuppuniya

Muneojiryeo handaedo gwaenchana neul geuraetdeut
Smile, smile, smile (Oh, woah)
Byeonhameopsi jigeumcheoreom neoui yeopeul yaksokalge
Ojik neoui happy, happy virus