Lisa Oh

Cadet Lisa Oh was assigned to Main Engineering aboard the USS Cantabrian (NCC-24705) in 2372.

"Catalyst, Part One"
On her first mission, she bumped into Captain Noel Turner (who was touring engineering) and, when asked, she said she felt her posting to the Cantabrian was a "dream come true".

During that same mission, Oh was one of the engineers helping Lieutenant Commanders Elizabeth Singh and Ethan Arden comb through data on flight recorders to find out any information they could on the Myhr'an. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")

Nate Wrightson
In 2372, the other engineering cadet assigned to the Cantabrian was Oh's classmate and close friend, Nate Wrightson. Every day they would walk together to and from their shift. One day, when Oh's boyfriend Nelson wouldn't answer the door-chime, Wrightson kept a look-out for Oh as she tried to break in. Another day, suspecting something was wrong with the odd-behaving Nelson, Wrightson helped Oh comb Nelson's quarters for anything out of the ordinary. They found his body, and Wrightson consoled Oh on her loss. (Star Trek: The Cantabrian Expedition: "Catalyst, Part One")

Elizabeth Singh
Obviously, Elizabeth Singh and Lisa Oh became close friends in a short period of time as, before dismissing them after a long day, Singh says something to the group but points at Oh, who blushes. The development of this friendship wasn't shown during the story, but it is assumed that during working together, Oh may have shared some personal details with Singh. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")

Nelson
In 2372, Lisa Oh was romantically involved with Nelson. He stood her up (which, she admitted, wasn't like him) on a date, but Oh later found this was due to the real Nelson being dead. She discovered his body with Wrightson, and she was very upset at the loss. It is not known where they met or when they started dating but it is assumed this was at Utopia Planitia Fleet Yards or earlier as Oh had Nelson's pass-code to his quarters, indicating a serious relationship. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")