Lee Byung-hun and Lee Min-jung's son asks for 100,000 won a month — too much or too little?

Actor Lee Min-jung has been wrestling with how much allowance to give the fifth-grade son.

Lee posted a video titled "The day we set my elementary school son's allowance" on her YouTube channel "Lee Min-jung MJ" on Wednesday.

In the video, Lee said her son would turn 13 by Korean age reckoning next year — old enough to go out on his own and buy things. "I'm planning to make him a prepaid card and load a set amount onto it each month," she said.

When Lee asked her son how much he wanted, he said 100,000 won ($75) a month — then added he would like "just a little more."

To settle on a figure, Lee visited the kinds of places her son typically spends money.

At a convenience store, a cup of ramyun, a triangle rice ball and a bottle of water came to 7,800 won. At a snack restaurant, tteokbokki, fish cake and fried seaweed rolls ran to 8,700 won. "I ordered less than he usually eats," Lee said. "It's expensive. Nothing comes in under 5,000 won."

She also stopped by her son's favorite taco restaurant, where menu prices hovered in the low-to-mid 10,000 won range. Lee sighed and said, "It's expensive."

Her last stop was Artbox, a stationery and lifestyle shop, where she picked up a notebook, an eraser and a few other school supplies. "I didn't buy much and it still came to 30,000 won," she said.

Based on her research, Lee concluded that about 40,000 won a week — school supplies included — seemed about right.

Online reactions were mixed. Some praised Lee for thinking carefully about instilling financial habits in her son and called the amount "modest," while others argued that 50,000 won a month was more appropriate for an elementary school student.

The figure Lee settled on is on the higher end compared with amounts cited in various surveys on elementary school students' allowances.

In a survey conducted last year by EBS Elementary On, 92 percent of elementary school students received 50,000 won or less per month, while 8 percent received more.

Hana Bank's Aibuza platform, a financial service for minors, also analyzed its own data and found that fifth-graders received an average monthly allowance of 40,000 won last year.