In "Wonderful World," Eun Soo-Hyun, a renowned psychology professor and writer, must face a complete change when her young son dies unjustly. The pain of seeing the perpetrator of this death go unpunished by the law causes her to lose all hope in this world. Stepping into desperation, she decides to take matters into her own hands and seek revenge on the one who harmed her son, hoping they would endure the same suffering she had gone through.

However, in this process, Eun Soo-Hyun unexpectedly becomes entangled with others who also endure similar pain. Among them, Kwon Sun Yool, a young man, appears and becomes her companion in the jouey to seek justice and solve mysterious cases. Sun Yool';;s support helps Eun Soo-Hyun not only find answers to her own case but also uncover new aspects of pain and hope.

"Wonderful World" is not just an entertainment film but also a story of patience, courage, and the thirst for justice and truth. With excellent performances and a captivating storyline, the film promises to touch hearts from beginning to end.