It’s been a while we haven’t heard about Kim Soo Hyun’s private life making headlines — until now. The latest controversy has exploded after the disclosure of intimate letters he allegedly wrote during his military service. These writings, including Kim Soo Hyun’s love letters and military diaries, are now shining new light on the longstanding allegations. At the center is his rumored underage relationship with the late actress Kim Sae-ron.
The New Evidence: Kim Soo Hyun’s Love Letters & Military Diaries
A key turning point in the debate is the recent release of about 150 letters that Kim Soo Hyun is said to have exchanged with a “real-life” girlfriend between January 2018 and his military discharge.
“As is already known, the actor had a real girlfriend whom he dated from 2016 until the spring of 2019. During his time in the military, he contacted her whenever he had free time, and he wrote daily about his feelings for her. These diary-style letters were brought out during his leave and shared with her, serving as records of their exchanges.”
Attorney Ko Sang Rok.
These letters were reportedly delivered personally during his leave periods. According to statements made by Attorney Ko Sang Rok of Phil Law Firm, these writings reflect genuine emotional sentiment from that period and are being offered as credible legal evidence — he argues that they carry no signs of manipulation.
Among the archived entries:
- July 30, 2018: “I’m definitely going to go on a trip with her this time next year… We will go far for a long time… I want to cherish and love each other deeply, but sometimes fight and make up.”
- August 3, 2018: “I still miss her and want to see her … I’m grateful she waits for me.”
The legal team contends these were regular love letters, not part of a broader scheme to counter accusations.
Meanwhile, the letter Kim Soo Hyun reportedly sent to Kim Sae-ron during his service (which circulated earlier) is now being reinterpreted differently. His defense says it was part of a broader habit of writing to acquaintances. The goal was to maintain connections while serving. They argue it is not proof of a romantic relationship at the time.
“When you look at the letters the actor wrote to his girlfriend at the time, there are clear contrasts with the ones sent to the late Kim Sae-ron. To his girlfriend, he wrote expressions like ‘I love you.’ To Kim Sae-ron, he only described his impressions of the day, the weather, and military life.”
Attorney Ko Sang Rok.
Timeline & Key Claims
As of March 31, 2025, Kim Soo Hyun publicly denied the claims of underage dating during a press conference. He stated that while he did date Kim Sae-ron, it was after she became an adult, and he denied any role in her tragic death.
Read our Kim Soo Hyun-Kim Sae-ron articles for the complete story.
Broader Fallout & Recent Developments (Quick Recap)
The fallout from the Kim Soo Hyun–Kim Sae-ron controversy continues to grow. Major brands like Prada and Dinto have cut ties, while Kim Soo Hyun has taken legal action through defamation lawsuits and criminal complaints. His upcoming Disney+ drama “Knock-Off” has also been delayed amid the backlash.
Meanwhile, Kim Sae-ron’s family is pressing on with their claims, stating they have additional evidence, including chats and unsent letters. Beyond the case itself, the situation has sparked broader public debate in South Korea about celebrity power, consent, and the treatment of young stars.
Kim Soo Hyun’s side is using the handwritten letters to show that his relationship was lawful and began in adulthood. However, critics and Kim Sae-ron’s family disagree. They pointed to other evidence, such as an earlier military letter, an unsent note, and conflicting timelines.
“The damage the actor is currently suffering stems from organized and malicious cybercrime. Fake news is not content; it is a crime. Society must now recognize cyber mob violence for what it is and take a firm stand against it.”
Attorney Ko Sang Rok.
The main legal issues are intent and timing, and no court has given a final decision yet. The public is watching closely, not only for the verdict but also for what the case means for celebrity accountability, power, and the legacy of both stars.
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