Baulkham Hills, North Parramatta triple death tragedy: Inside the humdrum suburban life of the martial arts master accused of murdering an entire family

A Taekwando master lived a normal life in a suburb with his wife and two children before allegedly killing a mother, her husband and a young child.

Kwang Kyung Yoo, 49 – owner of Lion’s Taekwondo in North Parramatta and also known as ‘Master Lion’ – is under arrest in connection with the alleged triple murder of Min Cho, 41, her husband Steven, 39, and a 7-year-old – old boy.

Police will allege he strangled the woman and boy at his Taekwando studio on Monday night before driving her white BMW X5 to her home in Baulkham Hills.

Yoo is accused of fatally stabbing her husband during an “altercation” in the house.

He is then said to have been driven to Westmead Hospital in Sydney covered in blood, where he was treated for knife wounds to his chest, arms and abdomen.

He underwent surgery before being arrested by police late last night. Charges are expected to be filed later today.

Detectives were seen searching the area around Yoo’s home in North Kellyville, in Sydney’s northwest, as the investigation into the tragedy continued on Wednesday.

The taekwando master is under arrest in connection with the alleged triple murder of Min Cho, 41, her husband Steven, 39, (pictured) and a 7-year-old boy.

Police allege Yoo fatally attacked the woman and boy at his taekwando studio on Monday evening (pictured)

A shocked neighbor said Yoo, his wife and their children – a 12-year-old girl and an 8-year-old boy – seemed like a “normal family.”

The last time he saw Yoo was Saturday when the Taekwando master was outside mowing his lawn.

Kwang Kyung Yoo had recently started as a professor at Macquarie University about seven months ago

“They are very quiet, but very nice,” he said. ‘He seemed quiet and kept to himself most of the time.

“But overall there was no fighting, no noise, nothing.”

The neighbor said Yoo had recently started working as a professor at Macquarie University about seven months ago, while his wife is a stay-at-home mother and the children attend a private school.

In addition, Yoo continued to run his popular Taekwando studio at night.

However, the neighbor revealed that Yoo revealed that the company was in financial difficulties.

“The business was closed,” he said. ‘He told me it was difficult. During Covid it was really bad, but after that it struggled a bit.

After allegedly killing Min Cho and the child, Yoo allegedly drove her white BMW X5 to her Baulkham Hills home (pictured) where he is accused of killing her husband, Steven Cho.

A neighbor revealed that Yoo admitted his martial arts business (pictured) was struggling financially and was talking about closing it

A neighbor said the last time he saw Yoo was when the taekwondo expert was mowing his lawn at the family home in North Kellyville as normal on Saturday (pictured)

“He’s been talking about closing it for a year.”

Police knocked on the doors of houses in the area on Tuesday morning and asked for CCTV footage that might be available.

The neighbor said yesterday was one of the few times he has ever seen visitors at Yoo’s house.

‘There were some people at the front talking to the police. I think it was their relatives,” he said.

“The police were here most of the day, from mid-morning until 3 p.m.”