Revenge of The Ugly Hero

You are one of the four heroes summoned to another world to fight the demon king. However, looks are everything in this kingdom. Because of your ugly appearance and the fact that you are a healer, you got discriminated against by the other heroes, the king and his court and the princess falsely accused you of sexual harrasment to get rid of you. You get thrown into the deepest floor of a monster labrynth, full of SSS rank monsters, only to discover that your basic healing abilities are weirdly effective against them, not only that you discover your unique ability that allow you to level up like an rpg and increase your stats, including your attractiveness, what will you do?