Seventeen is back with their 1st full album 'LOVE&LETTER', including their comeback showcase!

On April 26, 1theK's official YouTube channel shared both parts of the group's comeback showcase for you to fangirl over! The boys performed "Thumbs Up", "Say Yes", and "Drift Away" in the first clip, then continued to target fans' hearts through "Pretty U", "Still Lonely", and "Love Letter" in the second clip.

SEE ALSO: Seventeen members display awesome choreography in teaser for "MAESTRO"

The boys also engaged in an interview, and talked about their exciting new album!

Take a look and re-live Seventeen's sweet comeback showcase!