It all began as a fighting tournament to seek out for the best fighter among all high school students in Korea. Mori Jin, a Taekwondo specialist and a high school student, soon learns that there is something much greater beneath the stage of the tournament. (Source: WEBTOONS)

For 820 years he had slumbered with no knowledge of mankind's advancement and scientific progress. The land which he once knew has become an unfamiliar place with new technology, attitudes, and lifestyles. Upon awakening, Cadis Etrama Di Raizel (aka Rai), seeks to familiarize himself with this era. He locates a loyal servant of his, Frankenstein, who is currently the principal of a South Korean High School. Rai decides that this school is the perfect place to help him learn about the modern world, enrolls, and begins associating with a group of good-natured students in order to 'blend in'. But this new world is no safer than the old; and the dignified, bewildered, technologically inept Rai finds himself embroiled in adventures both ridiculous and dangerous.

There is a tower that summons chosen people called "Regulars" with the promise of granting their deepest desires. Whether it be wealth, fame, authority, or something that surpasses them all—everything awaits those who reach the top. 
 
Twenty-Fifth Bam is a boy who had only known a dark cave, a dirty cloth, and an unreachable light his entire life. So when a girl named Rachel came to him through the light, his entire world changed. Becoming close friends with Rachel, he learned various things about the outside world from her. But when Rachel says she must leave him to climb the Tower, his world shatters around him. Vowing to follow after her no matter what it takes, he sets his sight on the tower, and a miracle occurs. 
 
Thus begins the journey of Bam, a young boy who was not chosen by the Tower but opened its gates by himself. They call his kind "Irregulars"—beings that have shaken the very foundation of the Tower each time they set foot inside it.

Line Webtoon