Namjuui Yeonjeogi Doeeo Beoryeotda

Naturally charming, Irene attracts women like a magnet, even when she doesn't mean to. Enter her best friend, Claudia, who refuses to marry any of her three suitors because of her affection for Irene. As a result, these powerful and mentally unstable men declare Irene as their rival in love and threaten her life. She knows none of them deserve to be with Claudia, but she doesn’t want to die! To save both her friend and herself, Irene must prove she's their ultimate rival, but will she succeed?

(Source: Tapas)

Note: Includes 13 extra chapters.