While preparing for their first concert tour Twiceland - The Opening - in February 2017, Twice expands their theme park in the special album Twicecoaster: Lane 2. The repackage album features all the songs from the best-selling Twicecoaster: Lane 1 and two new songs including the title number Knock Knock and "Melting." A remix of the smash hit TT is also on the tracklist. This album is released in two versions with different covers and booklet images. Customers who purchase this product will have one of the versions selected for them at random. Each version comes with a 96-page photobook, a sticker, a random photo card, a lyric booklet and a random special gift.