are they the ACTUAL main characters? i mean- its them right? in the icon

Well for this season yes, in the previous, it was another couple which is shown a few times in the current chapters.

There are two seasons and two main couples. The one on the icon is the second main couple and the best one so far ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄