Great booklet - very helpful explanation of the gospel. As opposed to most tracts and briefer presentations of the gospel, this booklet focuses on the "big story," encompassing creation, fall, redemption, and restoration. Perhaps its greatest strength is the way it ties mission into the telling of the gospel. There is no mistaking here that signing up for Christianity entails becoming a follower of Jesus and becoming part of God's work in the world.
As a rule I try to avoid critiquing books based on what isn't there, but in this case I'm afraid that's where my criticism lies. What Choung shares is an important (and often untold) part of the good news for sure, but personal sin, and consequently Christ's death as atonement for that sin, is minimized. The cross and resurrection are given primarily as our example to follow and the basis of our empowerment for God's mission in the world. Both true! Yet other biblical models of atonement that focus more on guilt and payment for our sin are not really in view here.
That said, I greatly appreciate what Choung has written. I no doubt will use this booklet in explaining the gospel, but probably in conjunction with other explanations as well to give a fuller picture of Christ's work.