App Mode 2 is a Manga/Manhwa/Manhua in (English/Raw) language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The “Mode II” app gives people superpowers. Sato, a weak high school student received an invitation and gained the ability to understand other people’s hearts. In addition, his sister June was seriously injured by a serial killer. Sato decided to use the ability from “Mode II” to find the culprit, but unbeknownst to him, he wasn’t the only one who gained an ability…