One of the shadiest residents of Rosewood will return in "Pretty Little Liars" season 7, and it means trouble for the Liars next season.

Actress Tammin Sursok announced her return as the mysterious but mischievous villain Jenna in the Freeform series through Instagram. And it seems like she will not have a happy reunion with Spencer (Troian Bellisario), Aria (Lucy Hale), Emily (Shay Mitchell), Hanna (Ashley Benson), and Alison (Sasha Pieterse), since she warned the fans of the series to #justwait and #beafraid.

Jenna and the Liars have a dark history together. Ali and her friends were the reason why she got blind after they caused a fire in her home. This prompted her to have a strong resentment to the girls, and she even came up with a lot of schemes and manipulations just to get back at them.

The character was last seen in season 5, but her name was mentioned in season 6 when the Liars revealed that she went out with Lucas (Brendan Robinson) during their Senior Prom.

Meanwhile, season 7 of "Pretty Little Liars" could also feature the blossoming romance between Emily and Alison.

The two made out when they were still in high school, but it never worked out because Ali was just using Emily's feelings to get what she wanted from her during that time. But the two developed a deeper friendship back in season 6, when Ali felt that the past continue to haunt her.

However, it was revealed at the end of the previous season that Ali's husband Dr. Elliot Rollins (Huw Collins) and Cece's (Vanessa Ray) real mother Mary Drake (Andrea Parker) are behind the ghostly apparitions. But Ali already checked herself in a mental facility treatment. Emily was the one who was with her all throughout Ali's breakdown.

Could this mean that Ali and Emily will finally have romantic feelings for each other in season 7?

"Pretty Little Liars" Season 7 returns to Freeform on Tuesday, June 21.