In 2015, Tang achieved breakthrough with starring roles in a series of hit dramas. In January, she starred in modern romance drama "My Sunshine" alongside Wallace Chung, based on the novel "He Yi Sheng Xiao Mo" by Gu Man. It was a major success, topping television ratings in its time slot and gained 10 million views online. She also starred in the period romance drama "Lady & Liar" alongside Hawick Lau, where she portrayed an acrobatics artist who transforms into a wealthy young mistress. "Lady & Liar" became the second highest rated drama for Jiangsu TV that year and broke 4 billion views online. In February, Tang starred alongside Li Yifeng in another period romance drama "Legend of Fragrance" as a perfumer. The drama was the highest rated drama for Hunan TV that year and broke the record for the highest ratings achieved in the first day of premiere. In June, Tang played the female lead A'ning in the popular tomb-raiding web drama "The Lost Tomb", based on the novel "Daomu Biji". "The Lost Tomb" is the most watched web drama of 2015 with over 2.8 billion views. In July, she starred in modern romance drama "Diamond Lover" with Rain, playing a jewelry designer. The drama was a commercial success with a peak rating of 1.249 and more than 3.3 billion views online Due to the success of her dramas, Tang was given the title of "1 billion queen" as all of her dramas have reached 1 billion views or more. She was nominated at the 17th Huading Awards for Best Actress in four different categories, and won Best Actress in the contemporary genre for her performance in "My Sunshine". She also became the promotional ambassador for the 7th China TV Drama Awards, where she won the awards for Actress with the Most Media Influence as well as Audience's Favorite Character. That year, Tang was ranked 20th on "Forbes" China Celebrity with an income revenue of 45 million yuan. Tang was crowned "Golden Eagle Goddess" for the 11th China Golden Eagle TV Art Festival due to her successful streak in television. Despite her success, Tang received criticism from repetitively playing the same kind of roles without any breakthrough.