She was then cast in the leading role of Korea's first female royal barista who plots to assassinate King Gojong through poisoned coffee in Gabi, adapted from the historical fiction novel Russian Coffee by Kim Tak-hwan. Lee agreed to star in the film via verbal agreement, but when she dropped out of the project ten days before filming began, production company Ocean Film sued her for breach of contract. In September 2012, the court ruled in favor of the plaintiff, ordering Lee to pay ₩21 million (US$19,000) in damages, or 40% liability. Lee was replaced by Kim So-yeon.
Lee, who is fluent in English and Mandarin, and has a significant fan base in China with more than six million followers on her Weibo microblog, made her Chinese television drama debut in 2012. Previous Korean actresses who had appeared in Chinese productions spoke their lines in Korean and were later dubbed, but Lee worked hard to master the language and fully memorized her lines, making her the first Korean actress to perform in Mandarin. In Love Recipe (internationally known as Love Actually) opposite Taiwanese actor Joe Cheng, she played a part-timer raising her niece on her own who discovers her talent for cooking at a dim sum restaurant and dreams of becoming a chef. It was shot in Shanghai and aired on Hunan TV. Also that year, her contract with DBM Entertainment ended, and she signed with a new agency, Forestar Entertainment.