Younha's teaser crashed as soon as it opened.

On June 21, Younha released her teaser video before her 4th official album, Supersonic releases on July 3. Younha's teaser crashed due to massive traffic.

Internet users commented, "I haven't heard Younha for long time. I miss her", "I wanted to see her teaser, but it crashed", "I heard John Park and Jay Park was featured in this album" and "Fans are going crazy since it has been a year and half."

Other Internet users commented, "Has Younha's teaser released? I only heard a bit of music and saw a countdown", "I cannot stop thinking about Younha's teaser", "Apparently Younha's popularity hasn't died away", "Younha has talent and looks. Fighting!" and "Is she going to play the piano again?"

Younha's 4th official album Supersonic will be available for reservation starting on June 22. Since it has been a year and half since her last album, Younha will also be participating in various programs and concerts as well.