Virus

Ok Taek-sun is a cynical translator who has lost her 'love cells' and all interest in romance until she is infected with a mysterious, fatal contagion known as the Toxo Virus. The virus has a unique side effect: it makes victims fall in love for no reason and induces overwhelming happiness. Taek-sun's personality shifts from moody to bright and romantic, leading her into a chaotic web involving a researcher named Soo-pil and her childhood friend Yeon-woo. She eventually encounters Lee Kyun, a virus expert and the only man capable of developing a cure for the beautiful but deadly infection.