It's been awhile since we've seen these two, but I've missed them so! Marcus Chang and Ivy Shao are well known for not only being the leads of Back to 1989, but also for having dated while they were filming the drama. Even though they called it quits not long after, they have remained very close friends and still hang out every now and then. Recently Marcus had a concert and who did he invite to sing a duet with him...Ivy of course! It's been 3 years since Back to 1989 aired but that song is still so beautiful - I only have a fan recording of it, but you can listen to the original recording here.
I think it's safe to say they still have a strong friendship and are very comfortable with each other as they mention at the end of the second video. But I'd say they also have a spark - looking at all these photos of the two of them, I wonder what the future holds...
