In My Previous Life, I was A Saint, But Now I Want To Cut Corners

Renaria suddenly remembers her memories from her previous life. In the past, she was a saint who was proficient in light magic, However, using this magic is life-threatening... The princess fakes attempting to kill herself because she is in love with Renaria's Fiance, the second prince. Using holy magic as is the duty of a saint, she loses her life reviving the princess. Now she is starting off her teenage years...