- California Doubling: It's unknown where scenes set in the Korean Demilitarised Zone
were filmed. But the production crew could not get permission due to security reasons; it was impossible to film them on location. - Casting Gag: In The Tale of Nokdu the character played by Park Da-yeon (Su-yeong) developed a Precocious Crush on and wanted to marry the character played by Jang Dong-yoon (Dong-jin). The exact same happens in this series.
- Dyeing for Your Art: The actors playing soldiers filmed their scenes while wearing military gear that weighed over 20kg.
- Similarly Named Works: Search is also the title of a 1972 American sci-fi series. And then there's Search: WWW, a 2019 South Korean romance series. The potential for confusion abounds.
- Time-Shifted Actor: Younger versions of three characters appear in the prologue or flashbacks. They're replaced with older actors when they reappear in the main story.
- Hong Ui-jun and Yu Seong-ju play Lee Hyeok.
- Park Chang-ik and Choi Deok-mun play Han Dae-sik.
- Jin Si-won and Kim In-woo play Baek Won-chul.
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