The ex-boyfriend of late K-pop star Goo Hara was jailed by an appeal court Thursday for blackmailing her over sex videos that played a part in her apparent suicide.

In 2018, Goo, a member of former girl group Kara, told local media that her ex had threatened "to end her entertainment career" by leaking their sex videos.

A CCTV clip of the couple showed the singer kneeling before him, seemingly begging him not to.

Goo was found dead at her home in November and is widely believed to have taken her own life after being targeted by abusive online comments following the reports about the videos.

The man, hairdresser Choi Jong-bum, was convicted of multiple crimes last year, including blackmail and inflicting injuries, and was given a suspended jail term.

Both he and the prosecution appealed. However, on Thursday, the Seoul Central District Court ordered a heavier sentence, jailing him for a year.

His blackmail over the footage had "seriously damaged" the late star's reputation and left her with "irreversible trauma," it said.

Choi "was well aware that the degree of damage would be very serious if the sex videos were leaked, given that the victim was a famous celebrity," the court said in a statement.

But the court ruled that there was "not sufficient evidence" that she did not consent to be filmed.

In conservative South Korea, women who appear in such videos often feel shame despite being the victims and face ostracism and social isolation if the images become public.

Goo focused on her solo career after Kara broke up in 2018 and completed a tour of Japan with her latest release shortly before her death in November.

About six months earlier, she had apologized to fans after being hospitalized following a suspected suicide attempt, saying she had been "in agony over a number of issues."

Goo's Instagram account has long been flooded with hateful comments about her appearance and her history with Choi.

Her death came a month after Sulli, another K-pop star and a close friend of Goo's, took her own life after a long struggle with online bullying.

(Cover: A South Korean man pays tribute at a memorial altar for K-pop star Goo Hara at the Seoul St. Mary's Hospital in Seoul, South Korea, November 25, 2019. /CFP)