Elena

The young Elena suddenly hears a call for help from the sea at night. Following the sound, she finds a beautiful giant clam washed up on the beach. Elena calls the coast guard team. They've never seen such a strange clam, and they don't believe it could have made a sound for Elena to hear. They manage to send the clam back to the sea. Elena still hears the clam singing to her in the night. She runs to the beach and looks at the starry sky listening to its song. The euphonious song reminds Elena of the legends of the Sirens.

Based on the reports from the fish, Elena finds the new Radiants trapped on an unnamed island and sends a distress signal to headquarters. The new Radiants become hungry as they await rescue... Elena takes a huge strange fish from the sea and slices it into pieces. "Help yourselves, please. Both the Siren and I like this fish." Seeing her gentle smiling face and knife skills while chopping off the fish's head, the Radiants are very impressed.

Many people like to talk to Elena, the sweet elder sister of SEED, about their troubles, and Elena keeps everyone's secrets safe. Elena also confides in the Siren, the giant clam, when she keeps those secrets for a long time. "Siren, it turns out that Kiraya, the little lion, dare not venture to the swimming pool, as she is deathly afraid of water!" "Vanessa became heartbroken from a breakup with her ex-boyfriend when he got alcohol poisoning after she pushed him to drink too much!" "The reason why Camille avoids participating in the sports meet is because she thinks sweatpants are just not fashionable. She's so naive." The Siren hears endless gossip and secrets that she doesn't really understand at all.

The giant warship captained by the hero Odysseus passes through the sea where the Siren dwells. This time he has to face the huge whirlpool and Scylla, a monster with six heads. Obviously, Odysseus and his team are unable to continue the fight in the face of increasingly fierce storms and attacks from monster. Their ship is also damaged from the monster. At this time, the Siren sings with the last of her strength behind a reef that Odysseus and his crew cannot see. The wind dies down, the thunder ceases, the raging waves calm down, and Scylla escapes into the deep sea. The hero and his crew take out their earplugs and celebrate victory, but the Siren behind the reef cannot speak and becomes a lens.

Living by the sea since childhood, Elena can hear the sound of the ocean in the breeze. She warns everyone about tsunamis. She can even hear the sound of fish, talking about tales of treasures under the sea. With this ability, Elena rescues a stranded giant clam when she is young. Elena joins the coast guard when she grows up. The weather changes abruptly and her ship is overturned by rough seas while returning from a rescue mission. She swims to the familiar sound of the clam after she sinks to the bottom of the sea. The clam spits out a magnificent lens shining with a sea-blue light. Elena is wrapped in the gentle light after grabbing the lens, and the entire ocean crowns her at that moment.