On September 4th, at 0:00 on the official SNS channel, the tracklist image of the group Stray Kids' 1st regular album repackage album 'IN生' and the title song 'Back Door', which had been wrapped in a veil, were first released.

The new song is like an invitation to enter the 'Back Door' and play with if you want to continue enjoying the excitement of the previous work, '神 Menu'.

The new album includes 'Rabbit and Turtle', which is the full version of the intro song 'GO生' of the first regular album released in June, and includes 'B Me',' Any', and 'Ex'.