Do it manually by finding your first 100 users one by one. No one outside of your friends and colleagues will start using this without being emotionally invested in the app or its founders, and the only way to get them to be is to build a relationship with each of them. However, just like any new relationship, you can't just start pitching yourself or your app at them -- it needs to be a two way conversation about how you can fulfill each other's needs. If you do this right, you'll find yourself not with 100 initial users, but 100 initial evangelists who will be constantly sending you feedback and ideas. Caveat: this will take a lot more work than you think. However, it'll also be far more rewarding than you think.
This is what I would do in your case:
1) Identify potential users in your target audience (single Asian friends of friends?)
2) Invite them to lunch or coffee on the basis of "wanting to learn more about their dating life as research for our company."
3) Make it all about them at first. Don't even tell them what you've built other than "a dating app" at first. They don't give a shit about your app, but they do give a shit about solving their own problems -- so let them talk about their problems. Also ask them about other aspects of their lives -- what they do for work, what they do for fun. People love talking about themselves and if you're genuinely interested in what they have to say, they'll be genuinely interested in how you think you can help them.
4) Now that you know what matters to them, tell them what you're working on but tailor your pitch to focus on how your app could solve their particular problem. Be honest -- tell them that you've just launched and you don't have many users yet -- but get them excited about the story and the vision of the app. People connect well to stories.
5) Give them a title. Make them feel special. Say you loved their feedback so much that you want them to join your official User Advisory Panel or something as a Founding Member, which means they get to test out new features before everyone else does, give feedback on existing features, come to sick launch parties with free beer, yadda yadda. Once people have titles, they're more likely to want to live up to them, especially if involves them being confided in for their brilliant opinions. I don't care if the person *actually* had good feedback or not -- this is more about stroking the person's ego than anything else. You can always ignore their feedback.
6) Find out what you can do for them, even outside the context of the app. Did they mention they're unhappy with their job? Connect them with a recruiter you know. Are they into Mumford and Sons? Find out when the band is playing and email them saying something like "hey, just saw this and thought of you -- wanted to make sure you knew about this show." Treat them like a friend and they'll want to reciprocate (in this case, by helping you with your app).
7) Ask them about their friends' dating lives. Then encourage them to introduce you to their friends. It's easier to get to 100 users if 2 out of every 3 users are coming from a friend referral, though it'll be nearly impossible to get strong referrals with dating apps early on since network effects only apply when strangers join the app; my dating life won't get any better if I have 50 or 50000 friends on the app, since I already know all of them. I recommend you take their friends out for coffee too and give them the full dog and pony show if you want them to actually sign up and use it.
And remember: your best new users are your existing users. Focus on retention above all else. It's better to have 10 invested users at first than 100 users who will be quick to delete your app after 3 days.