Oh Yeon-joo is a fictional character from the South Korean television series W: Two Worlds. She is a medical intern who becomes entangled in a web of fantasy and reality when she discovers a webtoon created by her father. As the story unfolds, Oh Yeon-joo finds herself pulled into the world of the webtoon, where she meets Kang Chul, the main character. Their interactions challenge the boundaries between the real world and the fictional universe, leading to unexpected adventures and emotional developments.