Mongkol Ruenrueng

An apprentice private detective is hired to gather evidence of a wealthy man's infidelity but falls in love with his target's adorable girlfriend.

In 1970, a string band called "The Possible" was really popular and made a fever among young people. One day, the band received a microphone as the present from a mysterious fan. Miraculously, the microphone was a time-machine that accidentally took them to the future, in 2007, where the modern music rules and they're just an out-of-date item.