There appears to be no major mainstream film titled "Lady Sonia" released in 2021 that features conventional romantic storylines. It is possible you are referring to one of the following works with similar names or themes:
There is a performer known as who appeared in a self-titled series (2007–2012) and various short films (e.g., Cleaning Out the Mancave in 2018), but these do not align with 2021 mainstream romantic storylines. SEX LADY SONIA(2021)
: It is highly praised for Mrunal Thakur's performance but criticized for its "Western savior syndrome" in the climax and for packaging sexual violence with mainstream entertainment tropes. 2. The Loneliness of Sonia and Sunny (2025/2026 Novel) There appears to be no major mainstream film