Invitation of Mystic Messenger (also known as the Mystic Messenger 수상한 메신저의 초대) is a webtoon published by BookCube and illustrated by MeriG. It is in the genre of Drama, Romance, and Mystery; published in Long Strip form.
The prologue was released on 3rd April 2020, but the episodes were started to release on 11th April 2020. Each episode costs KRW 400, excluding the first 2 episodes and prologue, which are free. It also can be rented at KRW 200 for three days.
The comic adaptation of the dating-sim game phenomenon has arrived! Hana is usually a glass-half-full sort of person, but lately, nothing seems to be going her way. After yet another fruitless day of job hunting, she finds herself pouring out all her frustrations to a stranger in the street. The kind stranger disappears before they get a chance to exchange names or numbers, however, leaving behind a phone with nothing but a single messenger app. “Can you read this message…?” As soon as Hana logs on, username “Unknown” tells her they know the person she is looking for. Although a little suspicious, she is intrigued.
Who was the stranger that lent her a shoulder to cry on? Who is this “Unknown” she is chatting with? To find the answers to her questions, she must first accept a mysterious invitation. Time to get reacquainted with Jumin, 707, Zen, Yoosung, Jaehee and the rest of Mystic Messenger! 
This chapter closely follows the events of the Common Route's Prologue.
A woman named Hana Kang picks up a stranger's phone. She receives texts from Unknown and is sent to a mysterious address. She reflects from the future on how this event would change her life forever.
Deviations from the Source Material
- MC has been replaced with a new character entirely. The new character named Hana Kang has her own personality and background.