“After you disappeared, everyone forgot you even existed.”
68 years ago, Kim Sibaek crash-landed in the other world Mak Slechth. Then, suddenly—he returned to Korea.
The moment he arrived, he reunited with Tae Woon, the younger "kid brother" he’d adored in childhood.
Though only 21 years had passed on Earth, the world had changed completely. Monsters had overtaken the planet, and humans awakened supernatural abilities.
And among those hunters, the most notorious S-rank hunter, infamous for his volatile and brutal personality, was none other than—Tae Woon.
“Why did he turn out like this…? My sweet Woonie used to smell like sunshine when standing still, like milk when he toddled around, his chubby cheeks were so plump and soft I couldn’t stop squishing them, and he was so tiny and adorable…”
But even now, Tae Woon was so precious to Sibaek that he couldn’t hurt him—not even in his eyes.
Before Sibaek could even begin to readjust to Earth, Tae Woon hit him with a shocking truth: Only Tae Woon remembers him. No one else recalls the Olympic gold medalist that Sibaek once was.
As Sibaek searches for a way to return to Mak Slechth, a system window suddenly appears before him— and throws down a series of weighty quests!
[Confess your love to a living being.]
[Oh, and by the way! If you refuse or fail, Earth will be destroyed.]
But as Sibaek hesitates, unsure whether to comply, the system delivers its final ultimatum:
Only by preventing Earth’s destruction will he learn the way back to Mak Slechth… Or will he?

Completed
The Mad Dog’s First Love Has Returned
AuthorLevia
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Followed 39 people
This title has been categorized as 'mature', therefore may contain intense violence, blood/gore, sexual content and/or strong language that may not be appropriate for underage viewers.
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Vol/Ch
Chapter Title
Release Date
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Ch. Side Story 7
The Mad Dog’s First Love Has Returned Side Story 7
July 4, 2025 -
Ch. Side Story 6
The Mad Dog’s First Love Has Returned Side Story 6
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Ch. Side Story 5
The Mad Dog’s First Love Has Returned Side Story 5
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Ch. Side Story 4
The Mad Dog’s First Love Has Returned Side Story 4
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Ch. Side Story 3
The Mad Dog’s First Love Has Returned Side Story 3
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Ch. Side Story 2
The Mad Dog’s First Love Has Returned Side Story 2
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Ch. Side Story 1
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Ch. 198
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Ch. 90
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Ch. 89
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Ch. 27The Mad Dog’s First Love Has Returned 27June 15, 2025
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Ch. 26The Mad Dog’s First Love Has Returned 26June 15, 2025
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Ch. 25The Mad Dog’s First Love Has Returned 25June 15, 2025
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Ch. 24The Mad Dog’s First Love Has Returned 24June 15, 2025
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Ch. 23The Mad Dog’s First Love Has Returned 23June 15, 2025
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Ch. 22The Mad Dog’s First Love Has Returned 22June 15, 2025
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Ch. 21The Mad Dog’s First Love Has Returned 21June 15, 2025
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Ch. 20The Mad Dog’s First Love Has Returned 20June 15, 2025
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Ch. 19The Mad Dog’s First Love Has Returned 19June 15, 2025
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Ch. 18The Mad Dog’s First Love Has Returned 18June 15, 2025
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Ch. 17The Mad Dog’s First Love Has Returned 17June 15, 2025
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Ch. 16The Mad Dog’s First Love Has Returned 16June 15, 2025
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Ch. 15The Mad Dog’s First Love Has Returned 15June 15, 2025
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Ch. 14The Mad Dog’s First Love Has Returned 14June 15, 2025
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Ch. 13The Mad Dog’s First Love Has Returned 13June 15, 2025
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Ch. 12The Mad Dog’s First Love Has Returned 12June 15, 2025
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Ch. 11The Mad Dog’s First Love Has Returned 11June 4, 2025
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Ch. 10The Mad Dog’s First Love Has Returned 10May 24, 2025
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Ch. 9The Mad Dog’s First Love Has Returned 9May 24, 2025
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Ch. 8The Mad Dog’s First Love Has Returned 8May 24, 2025
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Ch. 7The Mad Dog’s First Love Has Returned 7May 24, 2025
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Ch. 6The Mad Dog’s First Love Has Returned 6May 24, 2025
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Ch. 5The Mad Dog’s First Love Has Returned 5May 24, 2025
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Ch. 4The Mad Dog’s First Love Has Returned 4May 24, 2025
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Ch. 3The Mad Dog’s First Love Has Returned 3May 24, 2025
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Ch. 2The Mad Dog’s First Love Has Returned 2May 24, 2025
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Ch. 1The Mad Dog’s First Love Has Returned 1May 24, 2025