The text you provided appears to be a file name for a video download of the Taiwanese drama, We Best Love: Fighting Mr. 2nd .
: Likely means "Special Edition" or "Special Episode." A director's cut titled We Best Love: Special Edition was released in June 2021. mp4 : The standard video file format for the download. Where to Watch Legally
If you're looking for high-quality, safe versions of the show, it is officially available on major streaming platforms rather than through potentially risky direct downloads: : The primary official platform for the series.