Let's climb the tower... again

Year 2093, humanity found themselves against monster beyond their knowledge. These creatures were ruthless being that kill, eat, play, and mock the existence of humanity—but along with the monsters existence, humanity found a tower that grant them power to defend themselves. The tower consist of 1,000 floors in total each floor giving you quest and power to defend against the monster on earth. It is said that one only need to reach floor 50 to comeback on earth, with an exchange of not being able to climb the tower once again. But for those who continued to climb beyond the floor 50 can continued to get stronger than those who gave up. Our mc Lean is a high ranking climer of this tower, after winning by pure luck on the floor 680+ he found himself betrayed and killed by the so called heroes of earth. But thanks to his contact with one of the beings in the tower he found himself woken in the future alive and given a chance to climb the tower once again. **** Pure fun writing, no proper plot just the mc climbing the tower. update 1-2 a week, if I can write them.