Earth is destroyed, and the sole survivor is the immortal being Seul Yun. After losing the only person she ever cared about, she is set out to seek revenge on the one behind it all – the emperor Horson. However, Seul finds herself lost in a strange world called Hetra. There, she must learn to harness her new abilities and fight against a new type of evil. Will Seul be able to hunt down the emperor and carry out her revenge? (Source: WEBTOON)