'The Bachelorette' Season Preview: A Man From Jenn's Past Joins the Journey Before Her Unprecedented Finale

A man from Jenn Tran's past tries to join 'The Bachelorette,' the show's season preview reveals.

Jenn Tran's journey for love won't be without drama. At the conclusion of Monday's season 21 premiere of The Bachelorette, fans get a peek at what's to come this season on the show.

The start of the preview is full of romance, as a "hopeful" Jenn goes skydiving, dances in the rain, kisses at a race track, plays with sheep and gets surprise visits from some Bachelor Nation favorites.

"I just feel so hopeful for what's coming at the end of this," she tells the cameras. "What could go wrong?"

A lot, it turns out. A surprise arrival prompts Jenn to gasp and question, "What is going on? What is he doing here? Oh my God. I can't do this."

She eventually fills the guys in on the situation, explaining, "This morning, someone from my past flew all the way here. He wants to be with me. He wants to join this journey."

The guys are less than welcoming to the new arrival, and drama abounds between the original men, too. 

'The Bachelorette' star Jenn Tran poses with a rose. - Disney/Ramona Rosales

"Maybe it's not in the cards for me to find somebody," Jenn says. "I feel like I'm not good enough. I also see a future in which I end up alone."

Jenn struggles with her own emotions as she tells one man, "I don't know how to be in a healthy relationship. I don't know how to be what you need me to be. I just feel like my whole life, I've been chasing the wrong people, the wrong feelings."

Then, in a pre-finale conversation with host Jesse Palmer, Jenn reveals, "I felt like I couldn't be myself. I'm done letting men dictate my relationships."

"No Bachelorette has ever done this before," he replies. "Are you sure you want to do this?"

"I have to choose myself," she answers, before telling the cameras, "What I'm about to do today is something I never thought I'd ever do starting this journey. I know what I want. I know what I deserve. I have to do what's right for me."

With that, standing at the location of her final rose ceremony, Jenn sets down the rose and walks away from the podium.

Jesse Palmer and Jenn Tran on the set of 'The Bachelorette.' - Disney/John Fleenor

When ET spoke to Jenn ahead of filming, she promised to be her true self throughout the journey.

"I'm really just gonna be my freaking self and that means all the good, the bad, and the chaotic, and the psychotic," she said. "That's really what you're gonna have to look forward to."

The Bachelorette airs Mondays on ABC.