Hello, gamer! Especially who play Seal Online.
Well, I play this game since December.
Then I just got confused about some quest.
This quest called 4 Heroes or if you wanna know, something this quest called Four Heroes Signature Quest. What makes me frustrated is you should take quest then back, take quest again and get back and do that every time. And when you see the guide in Wiki, make me more frustrating. 

Well, let me try to make a guide for this four hero quest. Hope all of you, who try to resolve this quest not getting confused with this quest from Seal Online game like me before.

1. You need to be at level 15 (my friend say that). You should go to Elim or Lime city. You should talk to D.End, D.Heroend, and D.Swordend. Go into the future behind D.End (warp portal). It contained three of the NPC, namely Joan, Iris and Peterson.
I talk to Iris and Joan, take all quest.
Talk to Joan select all the options. After that talk to Joan select again all the options. There will be Dr. Joan quest of finding out why the bale is lost in the future. Then talk to Iris, will be able to choose all of her quest to find the whereabouts of four heroes Shiltz. If you've spoken again to Iris and select all the options.

2. Get out of the warp and forth into town Lime / Elim, talk to D.End, select all. Talk again and select all again.
Signature photo
Talk to D.Heroend and select all. After that ask for photos of her four heroes (Arus, Baldea, Claire, Duran).
My friend said they're a different quest path. But, because I don't know. I just take what quest who have place or direction near to me. (My friend say if you play girl goes to Claire first. If a boy goes first to Arus. I don't know why different)

Arus
Signature from this handsome man.
  • Arus are in Elim City bar who named Black Knight, talk to him and select all the options. He'll ask you to go to a fortune teller called Shina in Madelin. Take 1 gold and ask all who asked Arus by him. Back to Arus and give answers. (Gold drop from Crow)
  • Because I play as a girl, it just stops the quest in Shina. That's because Arus have heard about us from his wife, Claire
Baldea
Easy signature quest gets from her.
  • Go into the Cave Clements in the northern city of Zaid. Baldea is on the 1st floor, around which the King of Death boss spawn. 
  • Instructions, as long as it is a straight road, follow the road, take the right way. And when the first you meet Ogre Cave, take the second track in right, if true then you will go to places where there are hundreds ruthless Skullo. Turn right while looking at your left, that's where Baldea. Just talk to her, and you will be able to sign his hand. Because in the cave, we could not see a place or position as we were in town.
Duran
Mini-boss signature quest. Careful!
  • Talk to Janet in central Militia (already have to be a member of the militia), ask about Duran to him, there will be a question "to ask the location of Duran", then "a little bit of information".
  • Talk to Slay (position in the central mission of Lime City). Talk to him. There will be a quest from him, give him 1 Gold. Give and we'll get chilled Liquor. Prepare 1 Silver (drop from Tarantulas in Crude Cave, North Lime City).
  • Go to the City of Elim, to the bar to talk to Roseanne, you can later tell quest give him 1 silver.
  • After getting the quest "First Knight". Go to Adel. In this quest, we will fight a mini-boss level 57. Use teleport services from the Temple of Adel, choose to go anywhere because in the end remains will be taken to Lime 315 years where there is NPC named Blitz. Talk to Blitz, and then wait for the monster appears. After that kill the monster. If done, you'll get a signature from Duran. Then talk to Blitz to go out.
 Claire
  • Claire is located in front of the palace Elim gate with the name NPC Noble. Talk to her and she will give the mission to meet Markus in Madelin (can be seen on the map). But, we are not allowed to enter by his secretary, Emilia. Give royal letter obtained from Claire, but still, we are not allowed in. We will get a quest "convincing Emilia". Bring 1 gold (can be obtained from Crow in Mimir River, go to Zaid and take down the warp portal), and then went to the fortune teller at Madelin called Shina. After the forecast, it turns out we have to go to church on Madelin.
  • Talk to NPC Erantess, then we will be able to quest to make food. Talk to one of the children (in the middle) next Erantess to make Nixie Soup. Water is a necessary ingredient (can be obtained from Erantess), Magic powder & Nixie scale (from Nixie), Milk (can buy at the bar). When completed, put forward the material to the NPC Kettle in front of Erantess, and immediately give to the child earlier. The children will thank you and ask you how to return the favor, tell him to talk with Emilia about your kindness.
  • Now Emilia already believes, you can go in and get permission to talk to Mark. Keep talking until there is an option to get out of the house of Mark. Then talk to Claire (I already get signature from Claire)
  • And then ask Aleph Crystal of Emilia. Go to the Clements Cave in Zaid, NPC encountered travel agent Zaid (in front of Clement) and then you will be transported on the floor 3. In the 3rd floor, turn right, continue straight until there NPC Corpse. Break crystal Aleph there. See little scene, and then talk to the NPC again to exit. Back again to Markus and tell me about what you see. Now go back to Claire, talk to him and ask for autographs.
DONE ! FINALLY DONE!
If you did all of this quest, go talk to D. Heroend. 
And you get your new title "Greenhorn"(My title is Recruit).
Really, this four heroes quest makes you travel all the map. Good luck if you start this quest right now! Haha.