South Korean President Yoon Suk Yeol’s ruling conservatives look to have stumbled badly in legislative elections held Wednesday, according to local exit polls on.wsj.com/4cL4iFf on.wsj.com/4cL4iFf

Older voters are taking over in the world's advanced economies—this week South Korea will offer an early glimpse at the collision between demographics and democracy on.wsj.com/3U9hEnb on.wsj.com/3U9hEnb

Samsung plans to more than double its total semiconductor investment in Texas to roughly $44 billion, a significant breakthrough in the U.S.’s quest to make more cutting-edge chips on.wsj.com/49xFSME

A Seoul court rejected an attempt by the LG founding family to recoup a sliver of the roughly $735 million they paid in inheritance taxes after the conglomerate's chairman died on.wsj.com/3PPrQyV on.wsj.com/3PPrQyV

South Korea’s SK Hynix said it plans to invest $3.9 billion in an advanced chip-packaging facility in West Lafayette, Ind., the latest win for Midwestern states seeking a bigger piece of America’s burgeoning semiconductor industry on.wsj.com/43MmJFt on.wsj.com/43MmJFt

North Korea, already one of the world’s most isolated countries, has walled itself off further over the past years on.wsj.com/49faHp9 on.wsj.com/49faHp9

South Korea’s SK Hynix plans to invest roughly $4 billion to build an advanced chip-packaging facility in West Lafayette, Ind. on.wsj.com/49gBYHE on.wsj.com/49gBYHE

In the event of a conflict with North Korea, a top secret bunker outside of Seoul would serve as a command and control center.

We went underground to the site where U.S. and South Korean operations would be centralized. on.wsj.com/3PCz0Gp on.wsj.com/4cr6Ho9

U.S. and South Korean military officials doubt the Kim regime is preparing a major assault. But South Korea’s defense minister has warned that an attack akin to 2010’s would be met with a “crushing defeat” of North Korean forces. on.wsj.com/4cwDsk4

In recent weeks, Kim Jong Un has mentioned Yeonpyeong by name, instructing his troops to bolster readiness in the area.

The dictator has exploited a fractured global order to harden North Korea into a menacing nuclear state. on.wsj.com/4a9RR3Q

The island has rebuilt itself from rubble after a North Korean artillery attack in 2010 killed four South Koreans.

Moon Sun-ki vividly remembers being stunned to witness artillery shells crushing Yeonpyeong’s small houses with flimsy roofs. on.wsj.com/4a5yJnv

As inter-Korean ties sink to their lowest in years, residents of the South Korean island of Yeonpyeong less than 2 miles from North Korean shores fear that the Kim Jong Un regime could launch a surprise assault on.wsj.com/3VsXHsJ on.wsj.com/3VtBJpu

Watch: WSJ goes inside an underground bunker facility outside of Seoul, where U.S. and South Korean military operations would be centralized in the event of a war with the Kim Jong Un regime. on.wsj.com/3vpGoxZ on.wsj.com/3vpGoxZ

With inter-Korean tensions high, fears are building on Yeonpyeong Island, less than 2 miles from North Korean shores. “There’s constant anxiety about a potential North Korean attack.” on.wsj.com/3TwtxlF on.wsj.com/3TwtxlF

Pet rocks, a kooky and best-forgotten fad of 1970s America, are resurfacing in South Korea. This time, it’s all about unwinding. on.wsj.com/3x2pvKs on.wsj.com/3x2pvKs

The top U.S. military official in South Korea said his thinking has changed on deterring North Korea’s nuclear weapons on.wsj.com/49J3eQj on.wsj.com/49J3eQj

A decade ago, just one of the world’s 10 most populous countries, India, had a leader who was 70 or older. Today, eight do.

What’s behind the boom in boomer presidents and prime ministers? on.wsj.com/3SSH4nn on.wsj.com/3SSH4nn

The ability of Kim Jong Un’s regime to unleash some form of nuclear attack on the world has never looked so credible.

The dictator has exploited a fractured global order to harden North Korea into a menacing nuclear state. on.wsj.com/49vn6WV on.wsj.com/49vn6WV

North Korean leader Kim Jong Un enlarged his nuclear arsenal and built ties to Russia, no longer aiming for reunification with South Korea. The U.S. and its allies are alarmed. on.wsj.com/3SSDTvY on.wsj.com/3SSDTvY

Samsung's Lee Jae-yong spent roughly 560 days behind bars in two separate stints during the past decade. Now that he's free of legal problems, what’s next for the electronics titan? on.wsj.com/3Tbp49e on.wsj.com/3Tbp49e