While The X-Files is a sci-fi procedural at its core, the relationship between its two leads arguably became more important than its mythology. Scully (Gillian Anderson) and Mulder (David Duchovny) reigned as one of TV's most iconic will-they-won't-they pairings for seven seasons until finally succumbing to their long-simmering romantic tension. Even after coupling up, their relationship is never typical, which is precisely why it continues to enamor so many fans.
Source：https://www.cbr.com/x-files-best-episodes-mulder-scully-romance/
