The big reveal that Jace is not a biological son of Valentine will have a tremendous effect on the nascent romance between Clary and Simon. A number of "Shadowhunters" Season 2 spoilers reveal that this potential love triangle will be featured in the upcoming episodes. Who will Clary choose between Simon and Jace, now that she knows the latter is not really her brother?

Will Jace Keep His Feelings Secret?

Matt Hastings, the Executive Producer and Director of the show, "Shadowhunters" Season 2 revealed about this potential love triangle. He suggested that Jace being an honorable man will not ruffle the newfound romance between Clary and Simon. Hastings says Jace is a knight in shining armor, and he will take time before she tells her the truth.

There Will Be Some Complications

Adding their own "Shadowhunters" Season 2 spoilers, showrunners Darren Swimmer and Todd Slavkin hinted that this budding love triangle will take a more complicated turn during the season two's second half. Die-hard fans will have to wait how these showrunners will develop this story of Clary, Simon, and Jace.

A Mysterious Character Will Appear

Meanwhile, some "Shadowhunters" Season 2 spoilers also revealed that a new and mysterious character will be introduced in the second half. Will Tudor, an actor in "Game of Thrones", will play the role of Sebastian. Slavkin said that he will play a major role in the story during the second half.

Elaborating on his "Shadowhunters" Season 2 spoilers, Slavkin further stated that Sebastian's entrance in the show will complicate the relationships of all the cast in the show. He added that Tudor's part in "The Mortal Instrument" is, somewhat, a bad boy. Is this a clue of what his character will be in the show? Slavkin added that Sebastian will bring something to the show that was not seen before.