Many celebrities, as their wealth builds, take to investing in real estate for the steady source of passive income it provides in addition to their main work.
Here are 10 K-pop idols who are publicly known as proud building owners (Note: all dollar amounts are approximate, based on the current exchange rate from Korean won):

In April 2016, Suzy purchased a building in the Samsung neighborhood of the Gangnam district in Seoul for about 3.7 billion won (approximately $3.3 million). The building is five stories tall with two basement levels, and Suzy makes about 15 million won ($13,400) monthly from the lease.

In 2017, Daesung purchased a building around Apgujeong Rodeo Station for 31 billion won ($27.7 million). The building is eight stories tall, and lease brings Daesung about 94.7 million won ($84,500) monthly.

Formerly of Kara, Han Seung Yeon purchased a four-story building in Cheongdam in April 2014 for roughly 4.5 billion won ($4 million). Afterward, the star invested 1.1 billion won ($982,000) in renovations for the building, after which the building is now appraised at 6.7 billion won ($6.0 million).
In 2017, Han Seung Yeon bought a building in the Samsung neighborhood with her and her mother as co-owners for 3.7 billion won ($3.3 million).
4. BIGBANG’s Taeyang

In May 2016, Taeyang purchased a seven-story building in Hannam for about 7.75 billion won ($6.9 million). The security deposits for the building total about 400 million won ($357,000), while the monthly lease brings in about 30 million won ($26,800).
In 2014, Taeyang also purchased a 2,490 square-foot villa located in the UN Village in Hannam for 4.2 billion won ($3.75 million).
5. Super Junior’s Kyuhyun

In 2014, Kyuhyun bought a six-story building near Myeongdong Station in Seoul for about 7.3 billion won ($6.5 million). The building is currently a guest house being run by Kyuhyun’s family.
6. Girl’s Day’s Yura

In March 2018, Yura revealed on tvN’s “Taxi” that she purchased a building in her hometown of Ulsan.
7. BIGBANG’s G-Dragon

In 2017, G-Dragon purchased a building in Cheongdam for roughly 8.8 billion won ($7.86 million). Previously in 2013, the star purchased a building in Seongsu for 3 billion won ($2.7 million).
8. Dasom

Former SISTAR member Dasom has long had an interest in real estate because her mother is a real estate agent. In 2014, she purchased a four-story building for 1.4 billion won ($1.25 million), which she sold two years later for 1.8 billion won ($1.6 million). In 2016, Dasom purchased a five-story building in the Jamsil neighborhood of the Songpa district in Seoul for about 3.1 billion won ($2.8 million).

Jung Yong Hwa is the owner of a four-story building in Cheongdam, which he purchased for about 10.5 billion won ($9.5 million). The building is currently leased by a luxury Swedish bed brand with a security deposit of 600 million won ($535,600) and monthly lease of 30 million won ($26,800).

Goo Hara, who purchased a building in Cheongdam in 2012 for about 1.1 billion won ($982,000), sold the building three years later for 2 billion won ($1.8 million).
In 2015, the star bought a building in Nonhyeon for 3.2 billion won ($2.9 million).
Source (1) (2) (3)