This Is Us season 5 episode 6 is going to be an emotional one for Randall Pearson (Sterling K. Brown). He will uncover some secrets about his past, particularly what really happened to his biological mother, Laurel (Jennifer Holmes). Along the way, he's going to meet a Vietnamese fisherman named Hai (Vien Hong).

Hai is one of the key persons in the upcoming This Is Us season 5 episode 6. There are a lot of questions about who exactly he is, but he's holding answers about Laurel. Randall will meet this person, who could tell him what his biological mother has been through over the past years.

Aside from being a fisherman and living in Louisiana, Hai's backstory wasn't really addressed. But, the upcoming episode might be exploring his life in the past -- beyond focusing on Laurel and Randall. In fact, co-executive producer K.J. Steinberg has something to say about the subject.

Speaking to Entertainment Weekly, Steinberg said that Hai is a Vietnamese refugee who ended up living as a fisherman in New Orleans Parish. He and Laurel will meet in a "most unlikely way." This is a chance to explore the history of the two in This Is Us season 5 episode 6.

Vietnam has been a significant place in the story. Jack Pearson (Milo Ventimiglia) went here during the war, while Kevin Pearson (Justin Hartley) traveled here to learn more about his father's past. Now, it's yet to be seen how Hai and Randall met and how their love story blooms.

The synopsis of This Is Us season 5 episode 6 didn't give too much detail on what's coming, but the official trailer teased it as an "exceptional hour." The title of the episode is "Birth Mother," which is a reference for Laurel's storyline.

Although some parts of Randall's biological mother have already been tackled, there are still a lot of mysteries surrounding her past. Laurel didn't die until 2015, though William Hill (Ron Cephas Jones) presumed she's dead for a long time.

Based on the clip, she faced a lot of struggles along the way and had a hard time finding her true self. She also looked for her baby, but seemingly gave up later on as she couldn't get the answers that she's been looking for. Everything that happened to her comes to light in this week's episode.

This Is Us season 5 episode 6 will be airing on Tuesday, January 12, on NBC.