𝐡𝐞𝐚𝐫𝐭𝐭𝐡𝐫𝐨𝐛𝐬 - 𝐚𝐩𝐩𝐥𝐲 𝐟𝐢𝐜

. - a boy group from the past finds themselves in the present in a dressing room in their younger form getting ready to debut.