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Certain people that are really kinky or into certain sexual subcultures (ex. BDSM) get implants into their dicks. It's literally a hard bead or pearl of body-safe plastic, inserted under the layer of skin along the shaft. It's done usually to enhance the texture of the penis, so that when it's rubbing inside, it's bumpy. Kinda like a ribbed condom. Some people get LOTS of them, like dozens all over or in rows. Sometimes it's just for aesthetics, like genital piercings, and officially it's listed on Wikipedia as a kind of body modification. Most commonly it's just understood in manhwa as a sex thing that really extreme people get. Like gangsters. Does it actually improve sex? In manhwa ...yes? Irl, apparently it varies.