In 2011, Chung was the second female lead in "Yes, Sir. Sorry, Sir!". She had just played her character Miss Koo from the 8th episode till the end. Although she only had unrequited love for one of the male lead in the series (Moses Chan), she became the focus for the audience and internet users by the three sections of Miss Koo. First, she appeared as a cool bowling coach initially. Next, Miss Koo seems to be a melting glacier as she was affected by Law Sir (Moses Chan's character), this made the audience pay enthusiastic attention on their sweet and emotional scenes. When it was nearly came to an end, Law Sir's undercover identity was finally revealed, Miss Koo was collapsed since she has been deceived by Law Sir and her sister (Queenie Chu's character). This also left a deep impression in the audiences' mind. The audiences had massive praises for her performance and agreed that she was perfectly capable of competing in Best Actress category for this role at the year-end awards ceremony, despite being second female lead. It was rare that the major newspapers also reported the above matter at the same time. She was not only supported by Chan and Yeung, but she also supported by Queenie Chu, Cilla Kung and Lau Ka Ho. On the whole, Chung received full of praise and Miss Koo is one of the representative work for Linda Chung.
Finally, she was nominated for Top 5 "Best Actress" and "Most Favourite Female Character Role" award for her role in "Yes, Sir. Sorry, Sir!". She got the My Most Supportive Performance award from Ming Pao Anniversary Awards in 2011 for Miss Koo in Yes Sir, Sorry Sir according to voting from audience. However, Miss Koo lost out the "Most Favourite Female Character Role" award at the 2011 TVB Anniversary Awards, and TVB was criticised as later the actual results of the online voting actually proved her the rightful winner of the "Most Favourite Female Character Role" award, instead of Myolie Wu. Fans were also outraged that she left the 2011 TVB Anniversary Awards empty handed.
Her new song "If You Want Me" has just released in January 2011. Chung was praised by CR2 DJ Vani Wong, Alton Yu and Wasabi for her outstanding performance. Apart from the above, she received much praises from three DJ who are in the CR2 "The Playtoy Mansion" program and she was also praised by Sammy Leung and Siu Yi in the CR2 "Good Morning King" program in February, for her "Jade Girl" image which is not only an image in the entertainment industry, but she also behaves in reality.
In 2011, her third album, My Private Selection, was released on 25 March. The album was qualitatively new songs plus choiceness. It was not only recorded her first plugged song "If you want me", but it also recorded another four new recording songs "Luo Suo", "De Xian Zhao Ni", "I'll Be Waiting For You", "Ngoi Dak Hei (Ai De Qi) solo version" and her thirteen choiceness songs from Dinner for One, World for Two debut album and My Love Story.