HIGH4 drop the MV for their comeback song 'Headache' from their 1st mini album 'HI HIGH'.

The MV is very lighhearted showing the boys being surprised by Haeryung out-of-nowhere appearances. The setting suggests a cheerful and lively story line. The song is an urban retro and funky with witty lyrics talking about a man thinking his girlfriend is the prettiest in the world. It is composed by PJ and Lee Jong Hoon.

HIGH4's 1st mini album 'Hi High' is consists of six tracks including their hit previous releases.